非常討厭Struts1 Action的設計,一堆花俏的概念,沒必要的復雜度.
但是工作關系,還非要使用這個垃圾,沒辦法,只好把蒼蠅包起來咽下去.
做一個Action基類,SimpleAction ,把它封裝的更像webwork.
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.HashMap;
import java.util.Map;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.beanutils.BeanUtilsBean;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
/**
* @author jindw
* @xwork.package name = ""
*/
public final class SimpleAction extends AbstractAction {
/**
* Commons Logging instance.
*/
protected static Log log = LogFactory.getLog(SimpleAction.class);
/**
* common result name define
*/
public static final String SUCCESS = "success";
public static final String ERROR = "error";
public static final String INPUT = "input";
/**
* method cache
*/
protected Map executeMap = new HashMap();
protected Map executeArgumentTypesMap = new HashMap();
public SimpleAction() {
super();
Method[] methods = this.getClass().getMethods();
for (int i = 0; i < methods.length; i++) {
Method method = methods[i];
if (String.class != method.getReturnType()) {
continue;
}
Class[] params = method.getParameterTypes();
int argCount = 0;
for (int j = 0; j < params.length; j++) {
if (ActionForm.class.isAssignableFrom(params[j])) {
argCount++;
} else if (HttpServletRequest.class.isAssignableFrom(params[j])) {
argCount++;
} else if (HttpServletResponse.class
.isAssignableFrom(params[j])) {
argCount++;
} else if (ActionMapping.class.isAssignableFrom(params[j])) {
argCount++;
} else {
argCount = -1;
break;
}
}
if (argCount >= 0) {
executeMap.put(method.getName(), method);
executeArgumentTypesMap.put(method.getName(), params);
}
}
initialize();
}
protected void initialize() {
Method[] methods = this.getClass().getMethods();
for (int i = 0; i < methods.length; i++) {
Class[] paramTypes = methods[i].getParameterTypes();
if (paramTypes.length == 1) {
String name = methods[i].getName();
if (name.startsWith("set")) {
name = name.substring(3);
if (name.length() > 0) {
char fc = name.charAt(0);
if (Character.isUpperCase(fc)) {
name = Character.toLowerCase(fc)
+ name.substring(1);
//implement it eg:get from Spring Context
Object value = getBean(name);
if (value != null) {
try {
methods[i].invoke(this,
new Object[] { value });
} catch (Exception e) {
log.info("set property error:", e);
}
}
}
}
}
}
}
}
public ActionForward execute(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response)
throws Exception {
// Get the method's name. This could be overridden in subclasses.
String methodName = getMethodName(mapping, form);
// Invoke the named method, and return the result
String result = dispatchMethod(mapping, form, request, response,
methodName);
request.setAttribute("actionForm", form);
if(result == null){
return null;
}else{
return transformForward(mapping.findForward(result), request);
}
}
/**
* @param forward
* @param request
* @return
*/
protected ActionForward transformForward(ActionForward forward,
HttpServletRequest request) {
if (forward == null) {
return null;
} else {
StringBuffer buf = new StringBuffer(forward.getPath());
boolean containsVariable = false;
for (int k = 0, i = buf.indexOf("${", k); i >= 0; i = buf.indexOf(
"${", k), k = i) {
int j = buf.indexOf("}", i);
if (j > 0) {
containsVariable = true;
k = j;
String key = buf.substring(i + 2, j);
Object o = null;
if(key.indexOf('.')<0){
o=request.getAttribute(key);
}else{
String[] keys = key.split("[.]");
o=request.getAttribute(keys[0]);
for(int l = 1;l<keys.length;l++){
try
{
o = BeanUtilsBean.getInstance().getPropertyUtils().getProperty(o, keys[l].trim());
}
catch (Exception e)
{
log.debug("find property error:", e);
o = null;
break;
}
}
}
buf.replace(i, j + 1, String.valueOf(o));
}
}
if (containsVariable) {
forward = new ActionForward(forward);
forward.setPath(buf.toString());
return forward;
} else {
return forward;
}
}
}
public static void main(String[] args) {
StringBuffer buf = new StringBuffer("http://sdssfs${123}&{123}&${sd}");
for (int k = 0, i = buf.indexOf("${", k); i >= 0; i = buf.indexOf("${",
k), k = i) {
int j = buf.indexOf("}", i);
if (j > 0) {
k = j;
String key = buf.substring(i + 2, j);
buf.replace(i, j + 1, "%" + key + "%");
}
}
System.out.println(buf);
}
protected String dispatchMethod(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response,
String methodName) throws IllegalArgumentException,
IllegalAccessException, InvocationTargetException {
Method method = (Method) executeMap.get(methodName);
Class[] argumentTypes = (Class[]) executeArgumentTypesMap
.get(methodName);
Object[] params = new Object[argumentTypes.length];
for (int i = 0; i < params.length; i++) {
Class type = argumentTypes[i];
if (ActionForm.class.isAssignableFrom(type)) {
if(type.isAssignableFrom(form.getClass())){
params[i] = form;
}else{
throw new ClassCastException("action form type is:"+form.getClass()+";but required:"+type+";");
}
} else if (HttpServletRequest.class.isAssignableFrom(type)) {
params[i] = request;
} else if (HttpServletResponse.class.isAssignableFrom(type)) {
params[i] = response;
} else if (ActionMapping.class.isAssignableFrom(type)) {
params[i] = mapping;
}
}
return (String) method.invoke(this, params);
}
protected String getMethodName(ActionMapping mapping, ActionForm form) {
String param = mapping.getParameter();
if (param != null) {
int i = param.indexOf("method=");
if (i > 0) {
int j = param.indexOf(i, ';');
if (j >= 0) {
return param.substring(i + ("method=".length()), j).trim();
} else {
return param.substring(i + ("method=".length())).trim();
}
} else {
if (this.executeMap.containsKey(param)) {
return param;
}
}
}
return "execute";
}
} |
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