Struts2 + Json + Jstl 展示

6.5. Json 內容展示

Struts 配置文件

<package name="information" extends="main" namespace="/inf">
        <action name="Information" class="com.example.action.Infomation">
            <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;


    private JsonObject jsonObject = null;
    private String jsonString = "";

    @Override
    public String execute() throws IOException {

        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}">
            <tr>
                <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" />

解決雙引號問題

<%@ 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="${fn:replace(json.value.getJsonString('ctime'),'\"', '')}" />
            <tr>
                <td><c:out value="${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')}" />


<a href="${pages.first}">首頁</a>
<a href="${pages.before}">上一頁</a>
<a href="${pages.next}">下一頁</a>
<a href="${pages.last}">尾頁</a>

<span>Count: ${pages.count}, Total: ${pages.total}</span>

來自： http://my.oschina.net/neochen/blog/552341