Struts2 + Json + Jstl 节选自 《Netkiller Java 手札》

Struts 配置文件

 package name="information" extends="main" namespace="/inf" 

 action name="Information" 

 result type="tiles" information /result 

 /action 

 /package 

Action 文件

package cn.netkiller.action;

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStreamReader;

import java.io.StringReader;

import java.net.URL;

import java.net.URLConnection;

import java.nio.charset.Charset;

import javax.json.Json;

import javax.json.JsonObject;

import javax.json.JsonReader;

import com.opensymphony.xwork2.Action;

import com.opensymphony.xwork2.ActionSupport;

public class Infomation extends ActionSupport{

 private static final long serialVersionUID = 1L;


 String URL = "http://www.example.com/list/json/93/20/0.html";

 System.out.printf("%s Requeted URL is %s", this.getClass().getName(), URL);

 StringBuilder sb = new StringBuilder();

 URLConnection urlConn = null;

 InputStreamReader in = null;

 try {

 URL url = new URL(URL);

 urlConn = url.openConnection();

 if (urlConn != null)

 urlConn.setReadTimeout(60 * 1000);

 if (urlConn != null urlConn.getInputStream() != null) {

 in = new InputStreamReader(urlConn.getInputStream(), Charset.defaultCharset());

 BufferedReader bufferedReader = new BufferedReader(in);

 if (bufferedReader != null) {

 int cp;

 while ((cp = bufferedReader.read()) != -1) {

 sb.append((char) cp);

 bufferedReader.close();

 in.close();

 jsonString = sb.toString();

 System.out.println(jsonString);

 JsonReader reader = Json.createReader(new StringReader(jsonString));

 JsonObject jsonObject = reader.readObject();

 this.setJsonObject(jsonObject);

 reader.close();

 // System.out.println(jsonObject.size());

 /*for (int i = 0; i jsonObject.size() - 2; i++) {

 JsonObject rowObject = jsonObject.getJsonObject(Integer.toString(i));

 // System.out.println(rowObject.toString());

 System.out.printf("%s\t%s\t%s\n", rowObject.getJsonString("id"), rowObject.getJsonString("title"),

 rowObject.getJsonString("ctime"));


 } catch (Exception e) {

 throw new RuntimeException("Exception while calling URL:" + URL, e);

 return Action.SUCCESS;

 public JsonObject getJsonObject() {

 return jsonObject;

 public void setJsonObject(JsonObject jsonObject) {

 this.jsonObject = jsonObject;

 public String getJsonString() {

 return jsonString;

 public void setJsonString(String jsonString) {

 this.jsonString = jsonString;

}

JSP 文件

 %@ page language="java" contentType="text/html; charset=UTF-8"

 pageEncoding="UTF-8"% 

 %@ taglib prefix="s" uri="/struts-tags"% 

 %@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"% 

 table 

 c:forEach items="${jsonObject.entrySet()}" var="json"

 varStatus="status" 

 c:if test="${not status.last}" 

 td ${json.key+1} /td 

 td ${json.value.getJsonString("id")} /td 

 td ${json.value.getJsonString("title")} /td 

 td ${json.value.getJsonString("ctime")} /td 

 /tr 

 /c:if 

 /c:forEach 

 /table 

===================

 c:forEach items="${jsonObject.entrySet()}" var="json" 

 ${json.value.toString()}

 /c:forEach 

===========

 s:property value="jsonString" / 

解决双引号问题

 %@ page language="java" contentType="text/html; charset=UTF-8"

 pageEncoding="UTF-8"% 

 %@ taglib prefix="s" uri="/struts-tags"% 

 %@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"% 

 %@ taglib uri="http://java.sun.com/jsp/jstl/functions" prefix="fn"% 

 table 

 c:forEach items="${jsonObject.entrySet()}" var="json"

 varStatus="status" 

 c:if test="${not status.last}" 

 c:set var="id"

 value="${fn:replace(json.value.getJsonString(id),\", )}" / 

 c:set var="title" value="${fn:replace(json.value.getJsonString(title),\", )}" / 

 c:set var="ctime"

 value="${fn:replace(json.value.getJsonString(ctime),\", )}" / 

 td c:out value="${status.count}" / /td 

 td a href="/inf/Detail.do?id= c:out value="${id}"/ " c:out

 value="${title}" / /a /td 

 td c:out value="${ctime}" / /td 

 /tr 

 /c:if 

 /c:forEach 

 /table 

 c:set var="pages" value="${jsonObject.getJsonObject(pages)}" / 


  java中好用的list转json的工具hutool 

 最近做服务器接口开发的时候遇到的小问题，数据库查询之后的数据怎样快捷的转化为json数据，第一时间想到了查库，查了挺久的，好多都是用代码实现，比较懒，这方面内容代码实现的偏多，虽然确实比较简单，但能快点就快点


 netkiller

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