这是简单的单个键值方式的，本文是一组2*2的4张图片展示存在数据库的jsonarray格式取出在页面展示的示例：
1.publicutil类
public class PublicUtil {
/**
* jsonArray转List<HashMap<String,String>>
* @param json格式字符串;
* */
//jsonArray格式
/**
[ {"pic":"http://address4","order":"4"},{"pic":"http://address3","order":"3"},{"pic":"http://address2","order":"2"},{"pic":"http://address1","order":"1"}]
*/
public static List<HashMap<String,String>> getPics(String pics) {
List<HashMap<String,String>>res = new ArrayList<HashMap<String,String>>();
if(pics==null||pics.equals("")||!pics.startsWith("[")||!pics.endsWith("]")){
return res;
}
JSONArray jsons = JSONArray.fromObject(pics);
JSONObject json = null;
HashMap<String,String>map = null;
String pic = null;
String order = null;
for(int i=0;i<jsons.size();i++){
json = jsons.getJSONObject(i);
pic = json.getString("pic");
order = json.getString("order");
if(pic!=null&&!"".equals(pic)&&order!=null&&!"".equals(order)){
map = new HashMap<String,String>();
map.put("order",order);
map.put("pic",pic.indexOf(".jpg")!=-1?pic:pic+".jpg");
res.add(map);
}
}
//给获取的list按照order字段排序
Collections.sort(res,new Comparator<HashMap<String,String>>() {
@Override
public int compare(HashMap<String,String> o1,HashMap<String,String> o2) {
int order1 = Integer.parseInt(o1.get("order"));
int order2 = Integer.parseInt(o2.get("order"));
System.out.println(order1<order2);
if (order1<order2) {
return -1;
}else{
return 0;
}
}
});
return res;
}
}
2.Controller类
@Controller
public class UserController {
@RequestMapping("add")
public ModelAndView addInfo(HttpServletRequest reqeust,HttpServletResponse response){
ModelAndView res=new ModelAndView("add");
res.addObject("name","塔睿");
//json开始，示例
String rels="[{\"pic\":\"地址1\""
+ ",\"order\":\"9\"},{\"pic\":\"地址2\""
+ ",\"order\":\"8\"},{\"pic\":\"地址3\",\"order\":\"7\"}]";
List<HashMap<String,String>> list= PublicUtil.getPics(rels);
res.addObject("list",list);
//json结束
//c:forTokens开始
String tags="a~b~c~d~~e";
res.addObject("tags",tags);
//c:forTokens结束
return res;
}
/*
* 可以使用如下方法收集数据并生成相应的JSON字符串
*/
@RequestMapping("one")
public void firstOne(){
//声明一个hash对象并添加数据
Map params=new HashMap();
params.put("name","名称1");
params.put("age","12");
/*params.put("name","名称2");
params.put("age","13");*/
//JSONArray检查对象类型调用正确的工厂方法
//声明JSONArray对象并输入json字符串
JSONArray array=JSONArray.fromObject(params);
//输出 [{"age":"12","name":"名称1"}]
System.out.println(array.toString());
}
}
3.jsp页面
<%@ page language="java" import="java.util.Map" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme() + "://"
+ request.getServerName() + ":" + request.getServerPort()
+ path + "/";
Map<String,String> menus=(Map<String,String>)request.getAttribute("menus");
%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<Meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
<script type="text/javascript" src="http://apps.bdimg.com/libs/jquery/1.6.4/jquery.min.js"></script>
<link href="http://libs.baidu.com/bootstrap/2.3.2/css/bootstrap.min.css" rel="stylesheet">
<script src="http://libs.baidu.com/bootstrap/2.3.2/js/bootstrap.min.js"></script>
</head>
<body>
<form>
获取：<input type="text" name="name" value="${name }"/><br/>
<!-- c:foreach遍历List<HashMap<String,String>> -->
<c:forEach items="${list }" var="lists">
<span>${lists.order }</span>
<input type="text" value="${lists.pic }"/><br/>
</c:forEach>
<!-- c:forTokens用法，delims按照这个进行分割,循环的次数也由‘~’个数决定 -->
<c:forTokens items="${tags }" delims="~" var="tag">
<input type="text" value="${tag }"/><br/>
</c:forTokens>
</form>
</body>
</html> 原文链接：https://www.f2er.com/json/289067.html