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前臺分頁

??1

package ?com.stt.doss.common.util;
??2

??3

import ?java.io.IOException;
??4

import ?java.util.ArrayList;
??5

import ?java.util.Collection;
??6

import ?java.util.Enumeration;
??7

??8

import ?javax.servlet.http.HttpServletRequest;
??9

import ?javax.servlet.jsp.JspException;
?10

import ?javax.servlet.jsp.JspWriter;
?11

import ?javax.servlet.jsp.PageContext;
?12

?13

import ?org.apache.log4j.Logger;
?14

?15

/**
?16

?*?<p>
?17

?*?Title:
?18

?*?</p>
?19

?*?<p>
?20

?*?Description:實現前臺分頁
?21

?*?</p>
?22

?*?<p>
?23

?*?Copyright:?Copyright?(c)?2006
?24

?*?</p>
?25

?*?<p>
?26

?*?Company:?stt
?27

?*?</p>
?28

?*?
?29

?*? @author ?william
?30

?*? @version ?1.0
?31

? */
?32

public ? class ?FrontSplitPageUtil? {
?33

?34

???? private ? static ?Logger?log? = ?Logger.getLogger(FrontSplitPageUtil. class );
?35

?36

???? private ? static ?String?PAGING_URL? = ? " PAGING_URL " ;
?37

?38

???? public ? final ? static ? int ?getCurrentPage(PageContext?pageContext,
?39

????????????String?collectionName,? int ?maxResults)? throws ?IOException,
?40

????????????JspException? {
?41

????????HttpServletRequest?request? = ?(HttpServletRequest)?pageContext
?42

????????????????.getRequest();
?43

????????Collection?collList? = ? new ?ArrayList();
?44

???????? if ?(request.getAttribute(collectionName)? != ? null )? {
?45

???????????? // ?get?collection?data?by?request
?46

????????????collList? = ?(Collection)?request.getAttribute(collectionName);
?47

????????} ? else ? if ?(request.getSession().getAttribute(collectionName)? != ? null )? {
?48

???????????? // ?get?collection?data?by?request
?49

????????????collList? = ?(Collection)?request.getSession().getAttribute(
?50

????????????????????collectionName);
?51

????????}
?52

?53

????????request.getSession().setAttribute(collectionName,?collList);
?54

?55

???????? int ?currentPage? = ? 1 ;
?56

?57

???????? int ?count? = ?collList.size();
?58

???????? int ?pageCount? = ?(count? % ?maxResults? == ? 0 )? ? ?count? / ?maxResults?:?(count
?59

???????????????? / ?maxResults? + ? 1 );
?60

???????? if (pageCount == 0 ) {
?61

????????????pageCount = 1 ;
?62

????????}
?63

???????? if ?(request.getParameter( " currentPage " )? != ? null )? {
?64

????????????currentPage? = ?Integer.valueOf(request.getParameter( " currentPage " ))
?65

????????????????????.intValue();
?66

???????????? if ?(currentPage? > ?pageCount)? {
?67

????????????????currentPage? = ?pageCount? == ? 0 ? ? ? 1 ?:?pageCount;
?68

????????????}
?69

????????}
?70

?71

???????? return ?currentPage;
?72

?73

????} ? // ?end?getCurrentPage
?74

?75

???? public ? final ? static ? int ?getCurrentOffset(PageContext?pageContext,
?76

????????????String?collectionName,? int ?maxResults)? throws ?IOException,
?77

????????????JspException? {
?78

?79

???????? int ?currentPage? = ?getCurrentPage(pageContext,?collectionName,
?80

????????????????maxResults);
?81

???????? return ?(currentPage? - ? 1 )? * ?maxResults;
?82

?83

????} ? // ?end?getCurrentOffset
?84

?85

???? public ? final ? static ? void ?showPage(PageContext?pageContext,
?86

????????????String?collectionName,? int ?maxResults)? throws ?IOException,
?87

????????????JspException? {
?88

?89

????????HttpServletRequest?request? = ?(HttpServletRequest)?pageContext
?90

????????????????.getRequest();
?91

?92

???????? int ?currentPage? = ?getCurrentPage(pageContext,?collectionName,
?93

????????????????maxResults);
?94

????????Collection?collList? = ? new ?ArrayList();
?95

???????? if ?(request.getAttribute(collectionName)? != ? null )? {
?96

???????????? // ?get?collection?data?by?request
?97

????????????collList? = ?(Collection)?request.getAttribute(collectionName);
?98

????????} ? else ? if ?(request.getSession().getAttribute(collectionName)? != ? null )? {
?99

???????????? // ?get?collection?data?by?request
100

????????????collList? = ?(Collection)?request.getSession().getAttribute(
101

????????????????????collectionName);
102

????????}
103

???????? int ?count? = ?collList.size();
104

????????JspWriter?out? = ?pageContext.getOut();
105

???????? // ?set?url
106

????????String[]?urlArray? = ?getHttpUrls(request,?count,?currentPage,?maxResults);
107

108

???????? // ?generate?html?string
109

????????String?sbTR? = ?getOutputString(pageContext,?count,?currentPage,
110

????????????????maxResults,?urlArray);
111

????????out.println(sbTR);? // ?output?html
112

113

????} ? // ?end?showPage
114

115

???? private ? static ?String[]?getHttpUrls(HttpServletRequest?request,? int ?count,
116

???????????? int ?currentPage,? int ?maxResults)? {
117

118

???????? int ?pageCount? = ?(count? % ?maxResults? == ? 0 )? ? ?count? / ?maxResults?:?(count
119

???????????????? / ?maxResults? + ? 1 );
120

???????? if ?(pageCount? == ? 0 )? {
121

????????????pageCount? = ? 1 ;
122

????????}
123

????????String?urlString? = ?request.getContextPath()
124

???????????????? + ?(String)?request.getSession().getAttribute(PAGING_URL);
125

126

????????Enumeration?enumParamNames? = ?request.getParameterNames();
127

128

???????? // ?build?url,add?firstRequest?and?maxResults?parameters?to?url.
129

????????StringBuffer?firstPageURL? = ? new ?StringBuffer(urlString);
130

????????StringBuffer?previousPageURL? = ? new ?StringBuffer(urlString);
131

????????StringBuffer?nextPageURL? = ? new ?StringBuffer(urlString);
132

????????StringBuffer?lastPageURL? = ? new ?StringBuffer(urlString);
133

????????StringBuffer?jumpToPageURL? = ? new ?StringBuffer(urlString);
134

135

????????firstPageURL.append( " ?currentPage=1 " );
136

137

????????previousPageURL.append( " ?currentPage= " ).append(
138

????????????????(currentPage? - ? 1 )? <= ? 0 ? ? ? 1 ?:?(currentPage? - ? 1 ));
139

140

????????nextPageURL.append( " ?currentPage= " ).append(
141

????????????????(currentPage? + ? 1 )? >= ?pageCount? ? ?pageCount?:?(currentPage? + ? 1 ));
142

143

????????lastPageURL.append( " ?currentPage= " ).append(pageCount);
144

145

????????jumpToPageURL.append( " ?currentPage={currentPageParameter} " );
146

147

???????? // ?append?old?parameters?to?url
148

???????? while ?(enumParamNames.hasMoreElements())? {
149

????????????String?paramName? = ?(String)?enumParamNames.nextElement();
150

???????????? if ?( ! paramName.equals( " currentPage " )
151

???????????????????? && ? ! paramName.equals( " maxResults " ))? {
152

????????????????String?paramValue? = ?(String)?request.getParameter(paramName);
153

????????????????previousPageURL.append( " & " ).append(paramName).append( " = " )
154

????????????????????????.append(paramValue);
155

????????????????nextPageURL.append( " & " ).append(paramName).append( " = " ).append(
156

????????????????????????paramValue);
157

????????????????firstPageURL.append( " & " ).append(paramName).append( " = " ).append(
158

????????????????????????paramValue);
159

????????????????lastPageURL.append( " & " ).append(paramName).append( " = " ).append(
160

????????????????????????paramValue);
161

????????????????jumpToPageURL.append( " & " ).append(paramName).append( " = " ).append(
162

????????????????????????paramValue);
163

????????????}
164

????????}
165

166

????????String[]?urlArray? = ? {?firstPageURL.toString(),
167

????????????????previousPageURL.toString(),?nextPageURL.toString(),
168

????????????????lastPageURL.toString(),?jumpToPageURL.toString()?} ;
169

170

???????? return ?urlArray;
171

????} ? // ?end?getHttpUrls
172

173

???? private ? static ?String?getOutputString(PageContext?pageContext,? int ?count,
174

???????????? int ?currentPage,? int ?maxResults,?String[]?urlArray)
175

???????????? throws ?JspException? {
176

177

???????? int ?pageCount? = ?(count? % ?maxResults? == ? 0 )? ? ?count? / ?maxResults?:?(count
178

???????????????? / ?maxResults? + ? 1 );
179

???????? if ?(pageCount? == ? 0 )? {
180

????????????pageCount? = ? 1 ;
181

????????}
182

???????? // ?generate?html?string
183

????????StringBuffer?sbTR? = ? new ?StringBuffer();
184

185

????????String?firstPageURL? = ?urlArray[ 0 ];
186

????????String?previousPageURL? = ?urlArray[ 1 ];
187

????????String?nextPageURL? = ?urlArray[ 2 ];
188

????????String?lastPageURL? = ?urlArray[ 3 ];
189

????????String?jumpToPageURL? = ?urlArray[ 4 ];
190

191

???????? // ?String[]?firstArg?=?{?firstPageURL?};
192

???????? // ?String[]?preArg?=?{?previousPageURL?};
193

???????? // ?String[]?nextArg?=?{?nextPageURL?};
194

???????? // ?String[]?lastArg?=?{?lastPageURL?};
195

196

???????? // ?parameter?for?paging?string
197

198

???????? // ?string?buffer?append
199

????????sbTR.append( " <td> " );
200

????????sbTR.append( " [<a?href=\ "" ?+?firstPageURL?+? " \ " ?>首頁</a>] " );
201

????????sbTR.append( " [<a?href=\ "" ?+?previousPageURL?+? " \ " ?>上一頁</a>] " );
202

????????sbTR.append( " [<a?href=\ "" ?+?nextPageURL?+? " \ " ?>下一頁</a>] " );
203

????????sbTR.append( " [<a?href=\ "" ?+?lastPageURL?+? " \ " ?>末頁</a>] " );
204

????????sbTR.append( " </td> " );
205

????????sbTR.append( " <td> " );
206

????????sbTR.append( " 當前第? " ? + ?currentPage? + ? " 頁?/?共 " ? + ?pageCount? + ? " 頁? " );
207

????????sbTR.append( " </td> " );
208

????????sbTR.append( " <td> " );
209

????????sbTR
210

????????????????.append( " 轉到<input?id=\ " jumpToPage\ " ?name=\ " jumpToPage\ " ?type=\ " text\ " ?class=\ " bd\ " ?size=\ " 4 \ " ?/>頁 " );
211

????????sbTR
212

????????????????.append( " <input?name=\ " ?GO?\ " ?type=\ " button\ " ?class=\ " bk\ " ?value=\ " ?GO?\ " ?onclick=\ " GoToURL2( ' "
213

???????????????????????? + ?jumpToPageURL
214

???????????????????????? + ? " ',document.all.jumpToPage.value)\ " /> " );
215

????????sbTR.append( " </td> " );
216

217

???????? // ?return
218

???????? return ?sbTR.toString();
219

????} ? // ?end?getOutputString
220

221

???? public ? final ? static ? void ?showPage(PageContext?pageContext,
222

????????????String?collectionName,? int ?maxResults,?String?target)
223

???????????? throws ?IOException,?JspException? {
224

225

????????HttpServletRequest?request? = ?(HttpServletRequest)?pageContext
226

????????????????.getRequest();
227

228

???????? int ?currentPage? = ?getCurrentPage(pageContext,?collectionName,
229

????????????????maxResults);
230

????????Collection?collList? = ? new ?ArrayList();
231

???????? if ?(request.getAttribute(collectionName)? != ? null )? {
232

???????????? // ?get?collection?data?by?request
233

????????????collList? = ?(Collection)?request.getAttribute(collectionName);
234

????????} ? else ? if ?(request.getSession().getAttribute(collectionName)? != ? null )? {
235

???????????? // ?get?collection?data?by?request
236

????????????collList? = ?(Collection)?request.getSession().getAttribute(
237

????????????????????collectionName);
238

????????}
239

???????? int ?count? = ?collList.size();
240

????????JspWriter?out? = ?pageContext.getOut();
241

???????? // ?set?url
242

????????String[]?urlArray? = ?getHttpUrls(request,?count,?currentPage,?maxResults);
243

244

???????? // ?generate?html?string
245

????????String?sbTR? = ?getOutputString(pageContext,?count,?currentPage,
246

????????????????maxResults,?urlArray,?target);
247

????????out.println(sbTR);? // ?output?html
248

249

????} ? // ?end?showPage
250

251

???? private ? static ?String?getOutputString(PageContext?pageContext,? int ?count,
252

???????????? int ?currentPage,? int ?maxResults,?String[]?urlArray,?String?target)
253

???????????? throws ?JspException? {
254

255

???????? int ?pageCount? = ?(count? % ?maxResults? == ? 0 )? ? ?count? / ?maxResults?:?(count
256

???????????????? / ?maxResults? + ? 1 );
257

???????? if ?(pageCount? == ? 0 )? {
258

????????????pageCount? = ? 1 ;
259

????????}
260

???????? // ?generate?html?string
261

????????StringBuffer?sbTR? = ? new ?StringBuffer();
262

263

????????String?firstPageURL? = ?urlArray[ 0 ];
264

????????String?previousPageURL? = ?urlArray[ 1 ];
265

????????String?nextPageURL? = ?urlArray[ 2 ];
266

????????String?lastPageURL? = ?urlArray[ 3 ];
267

????????String?jumpToPageURL? = ?urlArray[ 4 ];
268

269

???????? // ?parameter?for?paging?string
270

271

???????? // ?string?buffer?append
272

????????sbTR.append( " <td> " );
273

????????sbTR.append( " [<a?href=\ "" ?+?firstPageURL?+? " \ " ?target=\ "" ?+?target
274

???????????????? + ? " \ " > 首頁 </ a > ] " );
275

????????sbTR.append( " [<a?href=\ "" ?+?previousPageURL?+? " \ " ?target=\ "" ?+?target
276

???????????????? + ? " \ " > 上一頁 </ a > ] " );
277

????????sbTR.append( " [<a?href=\ "" ?+?nextPageURL?+? " \ " ?target=\ "" ?+?target
278

???????????????? + ? " \ " > 下一頁 </ a > ] " );
279

????????sbTR.append( " [<a?href=\ "" ?+?lastPageURL?+? " \ " ?target=\ "" ?+?target
280

???????????????? + ? " \ " > 末頁 </ a > ] " );
281

????????sbTR.append( " </td> " );
282

????????sbTR.append( " <td> " );
283

????????sbTR.append( " 當前第? " ? + ?currentPage? + ? " 頁?/?共 " ? + ?pageCount? + ? " 頁? " );
284

????????sbTR.append( " </td> " );
285

????????sbTR.append( " <td> " );
286

????????sbTR
287

????????????????.append( " 轉到<input?id=\ " jumpToPage\ " ?name=\ " jumpToPage\ " ?type=\ " text\ " ?class=\ " bd\ " ?size=\ " 4 \ " ?/>頁 " );
288

????????sbTR.append( " ?[<a?href=\ " #\ " ?onclick=\ " javascript:GoToURL( this , ' "
289

???????????????? + ?jumpToPageURL? + ? " ',document.all.jumpToPage.value,' " ? + ?target
290

???????????????? + ? " ')\ " ?target = \ "" ? + ?target? + ? " \ " > ?GO? </ a > ] " );
291

????????sbTR.append( " </td> " );
292

293

???????? // ?return
294

???????? return ?sbTR.toString();
295

????} ? // ?end?getOutputString
296

} ? // ?end?FrontSplitPageUtil
297

posted on 2007-03-16 15:25 張金鵬閱讀(503) 評論(0) 編輯收藏所屬分類: core java中的一些數據結構的處理

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