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记录一�ơkafka-manager1.3.3.18 Consumers is not display with kafka2.1.0 version

fly — Thu, 13 Dec 2018 07:36:00 GMT

摘要: 使用kafka 2.1.0 ,然后用最新的kafka-manager 1.3.3.18来管理kafka, 然后写了一个生产者和消费者程序，�E�序�q�行后，��L��昄��不出来程序运行后�Q�消费者的group��L��昄��不出来。生产者代码如下：package com.kafka.producer;import org.apache.commons.lang3.exception.Excepti... 阅读全文

fly 2018-12-13 15:36 发表评论

@RequestParam与@PathVariable的区别（转）

fly — Wed, 22 Aug 2018 03:05:00 GMT

�?a title="Java EE知识�? target="_blank" style="margin: 0px; padding: 0px; color: #000000;">spring MVC中，两者的作用都是��request里的参数的值绑定到contorl里的�Ҏ��参数里的�Q�区别在于，URL写法不同�?/p>

使用@RequestParam�Ӟ��URL是这��L��Q�http://host:port/path?参数�?参数�?br style="margin: 0px; padding: 0px;" />

使用@PathVariable�Ӟ��URL是这��L��Q�http://host:port/path/参数�?br style="margin: 0px; padding: 0px;" />

例如�Q?/p>

[java] view plain copy

@RequestMapping(value="/user",method = RequestMethod.GET)
public @ResponseBody
User printUser(@RequestParam(value = "id", required = false, defaultValue = "0")
int id) {
User user = new User();
user = userService.getUserById(id);
return user;
}
@RequestMapping(value="/user/{id}",method = RequestMethod.GET)
public @ResponseBody
User printUser2(@PathVariable int id) {
User user = new User();
user = userService.getUserById(id);
return user;
}

上面两个�Ҏ��Q�访问�\径分别如下：

fly 2018-08-22 11:05 发表评论

fly — Tue, 30 Jan 2018 08:16:00 GMT

我们在��用spring3的时候，如果使用了注解的话，我们会发玎ͼ�有时候我们界面的js/css/jpg/gif�{�文件会出现找不到的情况�Q�然而检查引用�\径，发现无论是绝对�\径还是相对�\径，都没错。这下我们就�U�结了，到底是什么问题呢�Q?/span>

��g��我也是苦思良久，不经意间看到了后台的日志�Q�才发现是spring搞的鬹{�?/span>

报错信息�Q?span style="box-sizing: border-box; margin: 0px; padding: 0px; color: #ff0000;">

解决�Ҏ��1�Q?span style="box-sizing: border-box; margin: 0px; padding: 0px; font-size: 14px;">在spring的配�|�修�?/strong>web.xml下对spring�?/strong>DispatcherServlet��h��url映射的配�|�，先来看看原配�|?/strong>�Q?/span>

[html] view plain copy

<servlet>
<servlet-name>springservlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServletservlet-class>
<load-on-startup>1load-on-startup>
servlet>
<servlet-mapping>
<servlet-name>springservlet-name>
<url-pattern>/url-pattern>
servlet-mapping>

�?/span>/把所有的��h��都交�l�spring��d��理了�Q�而所有available的请求url都是在Constroller里��用类似@RequestMapping(value = "/login/{user}", method = RequestMethod.GET)�q�样的注解配�|�的�Q�这��L��话对js/css/jpg/gif�{�静态资源的讉K��׃��得不到。所以，�?span style="box-sizing: border-box; margin: 0px; padding: 0px;">web.xml里添加如下的配置��可以解册��问题了�?/span>
[html] view plain copy
<servlet-mapping>
     <servlet-name>defaultservlet-name>
     <url-pattern>*.cssurl-pattern>
servlet-mapping>

<servlet-mapping>
    <servlet-name>defaultservlet-name>
    <url-pattern>*.gifurl-pattern>

servlet-mapping>

<servlet-mapping>
     <servlet-name>defaultservlet-name>
     <url-pattern>*.jpgurl-pattern>
servlet-mapping>

<servlet-mapping>
     <servlet-name>defaultservlet-name>
     <url-pattern>*.jsurl-pattern>
servlet-mapping>
解决�Ҏ��2�Q?span style="box-sizing: border-box; margin: 0px; padding: 0px; color: #000000; font-size: 14px;">在spring的配�|�文件中��d��如下一行：
注意�Q�需要是spring3.0.5以上版本

解决�Ҏ��3�Q?/strong>在spring的配�|�文件中��d��如下一行：



�q�个配置告诉spring 静态资源的处理方式

转： http://blog.csdn.net/miss_kun/article/details/52047381

fly 2018-01-30 16:16 发表评论

fly — Mon, 25 Sep 2017 16:20:00 GMT

Java代码
public class ConsistentHash {

       private final HashFunction hashFunction;
       private final int numberOfReplicas;
       private final SortedMap circle = new TreeMap();

       public ConsistentHash(HashFunction hashFunction, int numberOfReplicas, Collection nodes) {
             this .hashFunction = hashFunction;
             this .numberOfReplicas = numberOfReplicas;

             for (T node : nodes) {
                  add(node);
            }
      }

       public void add(T node) {
             for (int i = 0; i < numberOfReplicas; i++) {
                   circle .put(hashFunction .hash(node.toString() + i), node);
            }
      }

       public void remove(T node) {
             for (int i = 0; i < numberOfReplicas; i++) {
                   circle .remove(hashFunction .hash(node.toString() + i));
            }
      }

       public T get(Object key) {
             if (circle .isEmpty()) {
                   return null ;
            }
             int hash = hashFunction .hash(key);
             // System.out.println("hash---: " + hash);
             if (!circle .containsKey(hash)) {
                  SortedMap tailMap = circle .tailMap(hash);
                  hash = tailMap.isEmpty() ? circle .firstKey() : tailMap.firstKey();
            }
             // System.out.println("hash---: " + hash);
             return circle .get(hash);
      }

       static class HashFunction {
             int hash(Object key) {
                   //md5加密后，hashcode
                   return Md5Encrypt.md5(key.toString()).hashCode();
            }
      }

       public static void main(String [] args) {
            HashSet< String> set = new HashSet< String>();
            set.add( "A" );
            set.add( "B" );
            set.add( "C" );
            set.add( "D" );

            Map< String, Integer> map = new HashMap< String, Integer>();

            ConsistentHash< String> consistentHash = new ConsistentHash( new HashFunction(), 1000, set);

             int count = 10000;

             for (int i = 0; i < count; i++) {
                   String key = consistentHash.get(i);
                   if (map.containsKey(key)) {
                        map.put(consistentHash.get(i), map.get(key) + 1);
                  } else {
                        map.put(consistentHash.get(i), 1);
                  }
                   // System.out.println(key);
            }

             showServer(map);
            map.clear();
            consistentHash.remove( "A" );

            System. out .println("------- remove A" );

             for (int i = 0; i < count; i++) {
                   String key = consistentHash.get(i);
                   if (map.containsKey(key)) {
                        map.put(consistentHash.get(i), map.get(key) + 1);
                  } else {
                        map.put(consistentHash.get(i), 1);
                  }
                   // System.out.println(key);
            }

             showServer(map);
            map.clear();
            consistentHash.add( "E" );
            System. out .println("------- add E" );

             for (int i = 0; i < count; i++) {
                   String key = consistentHash.get(i);
                   if (map.containsKey(key)) {
                        map.put(consistentHash.get(i), map.get(key) + 1);
                  } else {
                        map.put(consistentHash.get(i), 1);
                  }
                   // System.out.println(key);
            }

             showServer(map);
            map.clear();

            consistentHash.add( "F" );
            System. out .println("------- add F服务�?nbsp; 业务量加�? );
            count = count * 2;
             for (int i = 0; i < count; i++) {
                  String key = consistentHash.get(i);
                   if (map.containsKey(key)) {
                        map.put(consistentHash.get(i), map.get(key) + 1);
                  } else {
                        map.put(consistentHash.get(i), 1);
                  }
                   // System.out.println(key);
            }

             showServer(map);

      }

       public static void showServer(Map map) {
             for (Entry m : map.entrySet()) {
                  System. out .println("服务�?nbsp;" + m.getKey() + "----" + m.getValue() + "�? );
            }
      }

}

fly 2017-09-26 00:20 发表评论

[原]FastDFS�Q?�Q�：Centos7 安装FastDFS+nginx module(�?

fly — Tue, 15 Dec 2015 06:22:00 GMT

本文原文�q�接: http://blog.csdn.net/freewebsys/article/details/45150941 转蝲��h��明出处！
1�Q�关于FastDFS
摘自�Q?a style="text-decoration: none; color: #000000;">http://www.oschina.net/p/fastdfs
FastDFS是一个开源的分布式文件系�l�，她对文�g�q�行��理�Q�功能包括：文�g存储、文件同步、文件访问（文�g上传、文件下载）�{�，解决了大定w��存储和负载均衡的问题。特别适合以文件�ؓ载体的在�U�服务，如相册网站、视频网站等�{��?/p>
FastDFS服务端有两个角色�Q�跟�t�器�Q�tracker�Q�和存储节点�Q�storage�Q�。跟�t�器主要做调度工作，在访问上赯��载均衡的作用�?/p>
存储节点存储文�g�Q�完成文件管理的所有功能：存储、同步和提供存取接口�Q�FastDFS同时�Ҏ��件的meta data�q�行��理。所谓文件的meta data��是文�g的相兛_��性，以键值对�Q�key value pair�Q�方式表�C�，如：width=1024�Q�其中的key为width�Q�value�?024。文件meta data是文件属性列表，可以包含多个键值对�?/p>
GitHub�Q?a style="text-decoration: none; color: #000000;">https://github.com/happyfish100/fastdfs
一个写的不错的博客�Q?a style="text-decoration: none; color: #000000;">http://tech.uc.cn/?p=221
2�Q�安装FastDFS
参考文档：
https://github.com/happyfish100/fastdfs/blob/master/INSTALL
2.1�Q�安装编译工�?/h4>
yum -y groupinstall 'Development Tools' yum -y install wget
2.2�Q�安装libfastcommon�c�d��
必须先按照这个，否则报错�Q?/p>
cc -Wall -D_FILE_OFFSET_BITS=64 -D_GNU_SOURCE -g -O -DDEBUG_FLAG -DOS_LINUX -DIOEVENT_USE_EPOLL -c -o ../common/fdfs_global.o ../common/fdfs_global.c -I../common -I/usr/include/fastcommon ../common/fdfs_global.c:20:20: fatal error: logger.h: No such file or directory #include "logger.h" ^ compilation terminated. ........
直接下蝲安装卛_��Q?/p>
wget https://github.com/happyfish100/libfastcommon/archive/master.zip unzip master.zip cd libfastcommon-master ./make.sh ./make.sh install
2.3�Q�安装FastDFS
wget https://github.com/happyfish100/fastdfs/archive/V5.05.tar.gz tar -zxvf V5.05.tar.gz cd fastdfs-5.05/ ./make.sh ./make.sh install
2.4�Q�启动FastDFS
安装之后配置文�g在目�?etc/fdfs�?/p>
mv storage.conf.sample storage.conf mv tracker.conf.sample tracker.conf
首先修改配置文�g�Q?nbsp;
/etc/fdfs/tracker.conf�Q�修改�\径到/data/fdfs目录�?/p>
# the base path to store data and log files base_path=/data/fdfs
启动�Q?nbsp;
/usr/bin/fdfs_trackerd /etc/fdfs/tracker.conf start
修改配置文�g�Q?nbsp;
/etc/fdfs/storage.conf�Q�修改�\径到/data/fdfs目录�Q�同旉��|�tracker_server地址�?/p>
# the base path to store data and log files base_path=/data/fdfs # tracker_server can ocur more than once, and tracker_server format is # "host:port", host can be hostname or ip address tracker_server=192.168.1.36:22122 # store_path#, based 0, if store_path0 not exists, it's value is base_path # the paths must be exist store_path0=/data/fdfs #store_path1=/home/yuqing/fastdfs2
/usr/bin/fdfs_storaged /etc/fdfs/storage.conf start
启动的时候，看日志没有错误就说明启动成功�?nbsp;
查看fdfs�q�程�Q?/p>
#ps -ef | grep fdfs root 19880 1 0 21:42 ? 00:00:00 /usr/bin/fdfs_trackerd /etc/fdfs/tracker.conf start root 20050 1 0 22:08 ? 00:00:00 /usr/bin/fdfs_storaged /etc/fdfs/storage.conf start root 20060 19915 0 22:08 pts/1 00:00:00 grep --color=auto fdfs
2.5 安装nginx + lua + fastdfs module
下蝲fastdfs-nginx-module模块
https://github.com/happyfish100/fastdfs-nginx-module
下蝲openresty nginx +lua�?/p>
wget https://github.com/happyfish100/fastdfs-nginx-module/archive/master.zip unzip fastdfs-nginx-module-master.zip wget http://openresty.org/download/ngx_openresty-1.7.10.1.tar.gz tar -zxvf ngx_openresty-1.7.10.1.tar.gz
�~�译安装�Q�这里注意下�Q�需要增加参数�?nbsp;
一个是stub_status�l�计模块�Q�一个是realip模块�?nbsp;
参考地址�Q?nbsp;
http://blog.danielss.com/?p=80
http://wiki.nginx.org/HttpRealipModuleChs
yum -y install pcre-devel openssl openssl-devel cd ngx_openresty-1.7.10.1 ./configure --with-luajit --with-http_stub_status_module --with-http_ssl_module --with-http_realip_module --add-module=/root/fastdfs-nginx-module-master/src gmake gmake install
nginx +lua安装路径�Q?/p>
nginx path prefix: "/usr/local/openresty/nginx" nginx binary file: "/usr/local/openresty/nginx/sbin/nginx" nginx configuration prefix: "/usr/local/openresty/nginx/conf" nginx configuration file: "/usr/local/openresty/nginx/conf/nginx.conf" nginx pid file: "/usr/local/openresty/nginx/logs/nginx.pid" nginx error log file: "/usr/local/openresty/nginx/logs/error.log" nginx http access log file: "/usr/local/openresty/nginx/logs/access.log"
启动�Q�重启nginx
#启动 /usr/local/openresty/nginx/sbin/nginx #重启 /usr/local/openresty/nginx/sbin/nginx -s restart
3�Q�测试FastDFS
配置服务�Q?/p>
cd /etc/fdfs mv client.conf.sample client.conf
修改配置�Q?/p>
# the base path to store log files base_path=/data/fdfs # tracker_server can ocur more than once, and tracker_server format is # "host:port", host can be hostname or ip address tracker_server=192.168.1.36:22122
配置nginx�Q?/p>
cp /root/fastdfs-nginx-module-master/src/mod_fastdfs.conf /etc/fdfs/ mkdir /data/ngx
修改mod_fastdfs.conf配置文�g�Q�修改tracker端口�Q�否则nginx启动不了。�\径也必须修改�Q�否则找不到文�g�?/p>
# the base path to store log files base_path=/data/ngx # FastDFS tracker_server can ocur more than once, and tracker_server format is # "host:port", host can be hostname or ip address # valid only when load_fdfs_parameters_from_tracker is true tracker_server=192.168.1.36:22122 # store_path#, based 0, if store_path0 not exists, it's value is base_path # the paths must be exist # must same as storage.conf store_path0=/data/fdfs
拯��配置文�g�Q�否则nginx启动不了�Q�报错：
[2015-04-28 11:30:14] ERROR - file: ini_file_reader.c, line: 315, include file "http.conf" not exists, line: "#include http.conf" [2015-04-28 11:30:14] ERROR - file: /root/fastdfs-nginx-module-master/src/common.c, line: 155, load conf file "/etc/fdfs/mod_fastdfs.conf" fail, ret code: 2 2015/04/28 11:30:14 [alert] 19969#0: worker process 2753 exited with fatal code 2 and cannot be respawned
解决办法�Q?/p>
cp /root/fastdfs-master/conf/http.conf /root/fastdfs-master/conf/mime.types /etc/fdfs
nginx配置修改vi /usr/local/openresty/nginx/conf/nginx.conf
server { listen 80; server_name localhost; charset utf8; location /M00 { alias /data/fdfs/data; ngx_fastdfs_module; } ......
创徏�q�接
ln -s /data/fdfs/data /data/fdfs/data/M00
重启nginx�?nbsp;
��试命��o�Q?/p>
echo "test fastdfs" > test.html /usr/bin/fdfs_test /etc/fdfs/client.conf upload test.html
上传成功�Q�执行结果：
This is FastDFS client test program v5.05 Copyright (C) 2008, Happy Fish / YuQing FastDFS may be copied only under the terms of the GNU General Public License V3, which may be found in the FastDFS source kit. Please visit the FastDFS Home Page http://www.csource.org/ for more detail. [2015-04-25 18:06:09] DEBUG - base_path=/data/fdfs, connect_timeout=30, network_timeout=60, tracker_server_count=1, anti_steal_token=0, anti_steal_secret_key length=0, use_connection_pool=0, g_connection_pool_max_idle_time=3600s, use_storage_id=0, storage server id count: 0 tracker_query_storage_store_list_without_group: server 1. group_name=, ip_addr=192.168.1.36, port=23000 group_name=group1, ip_addr=192.168.1.36, port=23000 storage_upload_by_filename group_name=group1, remote_filename=M00/00/00/wKgC1FU7ZxGAF19vAAAADcvBslg01.html source ip address: 192.168.1.36 file timestamp=2015-04-25 18:06:09 file size=13 file crc32=3418468952 example file url: http://192.168.1.36/group1/M00/00/00/wKgC1FU7ZxGAF19vAAAADcvBslg01.html storage_upload_slave_by_filename group_name=group1, remote_filename=M00/00/00/wKgC1FU7ZxGAF19vAAAADcvBslg01_big.html source ip address: 192.168.1.36 file timestamp=2015-04-25 18:06:09 file size=13 file crc32=3418468952 example file url: http://192.168.1.36/group1/M00/00/00/wKgC1FU7ZxGAF19vAAAADcvBslg01_big.html
��试讉K��Q?/p>
curl http://192.168.1.36/M00/00/00/wKgC1FU7ZxGAF19vAAAADcvBslg01_big.html
如果�q�回“test fastdfs”说明配置成功。上面的每一步修攚w��要正��才可以�?/p>
查看nginx错误日志�Q?nbsp;
tail -f /usr/local/openresty/nginx/logs/error.log
4�Q��ȝ��
FastDFS非常好的分布式文件系�l�。配�|�简单，可以多机器部�|Ԍ��同时官方�l�了一个Nginx模块�Q�可以直接用nginx讉K��Q�非常方�ѝ��这样减��了中间的tomcat层，效率高�?nbsp;
接下来��l�研�I�lua的图片压�~�。直接在nginx层进行图片压�~�。效率更高，同时囄��d��FastDFS的文件�?/p>

fly 2015-12-15 14:22 发表评论

proxool详细配置

fly — Wed, 28 Jan 2015 03:30:00 GMT
     摘要: proxool一个数据库�q�接池框�Ӟ��提供了对你选择的其它类型的驱动�E�序的连接池��装。可以非常简单的�U�L��到现存的代码中。完全可配置。快速，成熟�Q�健壮。可以透明��Cؓ你现存的JDBC驱动�E�序增加�q�接池功能。到目前为止最新版本是proxool 0.9.1,可从官网下蝲最新版本http://proxool.sourceforge.net 一、配�|�proxool.xml�?..  阅读全文

fly 2015-01-28 11:30 发表评论

Transaction has been rolled back because it has been marked as rollback(�?

fly — Sat, 20 Dec 2014 06:23:00 GMT

框架采用的是spring��理声明式事务，�q�几天业务开发时遇到了点�ȝ��Q�记录下备忘�?/p>

场景�Q�在Service�c�M��使用子事�?saveponit)�Ӟ��当子事务抛出异常后，此异常处理掉不��l�往外抛�Q�spring在提交主事务时会抛出

org.springframework.transaction.UnexpectedRollbackException: Transaction has been rolled back because it has been marked as rollback

�Ҏ��调用�l�构�Q?/p>
假若有A、B、C三个Service�c�，其实例对象分别�ؓa、b、c,�c�d��别定义如下：

A {

�Ҏ��() { //propagation="REQUIRED"

try{

b.�Ҏ��();

} catch (Exception e) {

}

}

}

B{

savePoint�Ҏ��() { //propagation="NESTED"

c.�Ҏ��(); //如果�q�里边的操作全是普通类�Q�不是Service�c�）操作�Q�不会有问题�?/p>
}

}

C{

�Ҏ��() { //propagation="REQUIRED"

throw new Exception("出错");

}

}

通过调试spring源码

......

Getting transaction for [A.�Ҏ��] .....

......

Creating nested transaction with name [B.savePoint�Ҏ��]........

......

Participating in existing transaction

Getting transaction for [C.�Ҏ��]

........

Participating transaction failed - marking existing transaction as rollback-only

//此时�Q�已把主事务标记成了rollback-only

所以，当在a.�Ҏ��完成时提交事务时会报Transaction has been rolled back because it has been marked as rollback错误�?/p>

认真的您可能会发玎ͼ��?org.springframework.transaction.support.AbstractPlatformTransactionManager 中有个叫

isGlobalRollbackOnParticipationFailure的参敎ͼ�默认是true.

源码中说明：

Switch this to "false" to let the transaction originator make the rollback decision. If a participating transaction fails with an exception, the caller can still decide to continue with a different path within the transaction. However, note that this will only work as long as all participating resources are capable of continuing towards a transaction commit even after a data access failure: This is generally not the case for a Hibernate Session, for example; neither is it for a sequence of JDBC insert/update/delete operations.

大意是：如果isGlobalRollbackOnParticipationFailure为false,则会让主事务军_��回滚�Q�如果当遇到exception加入事务��p�|�Ӟ��调用者能�l�箋在事务内军_��是回滚还是��l�。然而，要注意是那样做仅仅适用于在数据讉K��p�|的情况下且只要所有操作事务能提交�?/p>



  初步解决�Ҏ��Q?/p>

�l�测试，此问题暂时得到解冻I��不知道会不会引�v其它问题�Q�至��目前还没有发现其它异常。您若通过此方案解决之后出��C��新的问题��L��信回复，我们一起交��，非常感谢�Q?/p>

fly 2014-12-20 14:23 发表评论

jaxb的解析xml和生成xml列子

fly — Thu, 11 Dec 2014 06:44:00 GMT
解析XML文�g:xml 文�g如下�Q?br />

111111
13141322
000001
交易��p�|

2222222
13141323
000000
交易成功

建立对应的JAVA bean�c?br />
Trans.java�c?/div>
package com.jaxb.test;
import java.util.List;
import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;
@XmlRootElement(name = "trans")
@XmlAccessorType(XmlAccessType.FIELD)
public class Trans{
@XmlElement(name = "tran")
private List data = null;
public List getData() {
return data;
}
public void setData(List data) {
this.data = data;
}
}
Tran.java�c?/div>
package com.jaxb.test;
import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlElement;
@XmlAccessorType(XmlAccessType.FIELD)
public class Tran {
@XmlElement(name = "requestId")
private Long requestId;
@XmlElement(name = "orderNo")
private Long orderNo;
@XmlElement(name = "returnCode")
private String returnCode;
@XmlElement(name = "returnInfo")
private String returnInfo;
public Long getRequestId() {
return requestId;
}
public void setRequestId(Long requestId) {
this.requestId = requestId;
}
public Long getOrderNo() {
return orderNo;
}
public void setOrderNo(Long orderNo) {
this.orderNo = orderNo;
}
public String getReturnCode() {
return returnCode;
}
public void setReturnCode(String returnCode) {
this.returnCode = returnCode;
}
public String getReturnInfo() {
return returnInfo;
}
public void setReturnInfo(String returnInfo) {
this.returnInfo = returnInfo;
}
}
建立��试�c?br />
import java.io.File;
import java.util.ArrayList;
import java.util.List;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Marshaller;
import javax.xml.bind.Unmarshaller;
public class TestJAXB {
public static void main(String[] args) {
try {
//read xml file to Java object
Trans trans = TestJAXB.readString(Trans.class,"input.xml");
List datas = trans.getDatas();
for (Tran o : datas) {
System.out.println(o.getReturnCode()+";"+o.getReturnInfo());
}

//write java object to xml
Tran tran = new Tran();
tran.setOrderNo(11111L);
tran.setRequestId(22222L);
tran.setReturnCode("0000");
tran.setReturnInfo("success");
Tran tran2 = new Tran();
tran2.setOrderNo(33333L);
tran2.setRequestId(44444L);
tran2.setReturnCode("0001");
tran2.setReturnInfo("failure");
Trans trxs = new Trans();
List list = new ArrayList();
list.add(tran);
list.add(tran2);
trxs.setDatas(list);
File file = new File("D:/output.xml");
JAXBContext jaxbContext = JAXBContext.newInstance(Trans.class);
Marshaller jaxbMarshaller = jaxbContext.createMarshaller();
// output pretty printed
jaxbMarshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
jaxbMarshaller.marshal(trxs, file);
jaxbMarshaller.marshal(trxs, System.out);
} catch (JAXBException e) {
e.printStackTrace();
}

}
@SuppressWarnings("unchecked")
public static T readString(Class clazz, String context) throws JAXBException {
try {
JAXBContext jc = JAXBContext.newInstance(clazz);
Unmarshaller u = jc.createUnmarshaller();
return (T) u.unmarshal(new File(context));
} catch (JAXBException e) {
throw e;
}
}
}

fly 2014-12-11 14:44 发表评论

Hibernate4之JPA规范配置详解(�?

fly — Wed, 29 Oct 2014 06:15:00 GMT
     摘要: @Table Table用来定义entity主表的name�Q�catalog�Q�schema�{�属性�?nbsp;属性说明： name�Q�表名catalog�Q�对应关�p�L��据库中的catalogschema�Q�对应关�p�L��据库中的schemaUniqueConstraints�Q�定义一个UniqueConstraint数组�Q�指定需要徏唯一�U�束的列Java代码  @Entity...  阅读全文

fly 2014-10-29 14:15 发表评论

8v天堂国产在线一区二区,欧美美乳视频网站在线观看,三级av在线播放

记录一�ơkafka-manager1.3.3.18 Consumers is not display with kafka2.1.0 version

@RequestParam与@PathVariable的区别（转）

[原]FastDFS�Q?�Q�：Centos7 安装FastDFS+nginx module(�?

1�Q�关于FastDFS

2�Q�安装FastDFS

2.1�Q�安装编译工�?/h4>yum -y groupinstall 'Development Tools' yum -y install wget

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2.3�Q�安装FastDFS

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3�Q�测试FastDFS

4�Q��ȝ��

proxool详细配置

Transaction has been rolled back because it has been marked as rollback(�?

jaxb的解析xml和生成xml列子

Hibernate4之JPA规范配置详解(�?

2.1�Q�安装编译工�?/h4>
`yum -y groupinstall 'Development Tools' yum -y install wget`