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Jackson.jar的使用记录

2024-07-26 07:23:18   216人阅读

Jackson.jar的使用记录

之前一直使用json-lib.jar,最近发现网上说这个jackson.jar比较好

package com.spring.controller;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.codehaus.jackson.JsonEncoding;
import org.codehaus.jackson.JsonGenerator;
import org.codehaus.jackson.map.ObjectMapper;
import org.codehaus.jackson.map.ObjectWriter;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.servlet.ModelAndView;

@Controller
public class JacksonController {
	
	@RequestMapping(value=http://www.mamicode.com/"user/jackson", method = {RequestMethod.POST,RequestMethod.GET})>
list转为json数组（是Java main程序）
package com.main.java.demo;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.List;

import org.codehaus.jackson.map.ObjectMapper;
import org.codehaus.jackson.map.ObjectWriter;

public class JacksonDemo {
	public static void main(String args[]) throws IOException{
		//writeListToJsonArray();
		//writeListToJsonArray2();
		//writeListToJsonArray3();
		//writeListToJsonArray4();
		//writeListToJsonArray5();
		writeListToJsonArray6();
	}
	
	/**
	 * list转为json数组
	 */
	public static String writeListToJsonArray() throws IOException {  
	    /*List<Event> list = new ArrayList<Event>(2);
	    list.add(new Event("a1","a2"));
	    list.add(new Event("b1","b2"));*/

		/*List<String> list = new ArrayList<String>();
	    list.add("A2");
	    list.add("B2");*/
		
		/*List<Integer> list = new ArrayList<Integer>();
	    list.add(12);
	    list.add(45);
	    list.add(5);*/
		
		List<Float> list = new ArrayList<Float>();
	    list.add((float) 12.32);
	    list.add((float) 45.12);
	    list.add((float) 5.09);
		
	    OutputStream out = new ByteArrayOutputStream();
	    ObjectMapper mapper = new ObjectMapper();
	    mapper.writeValue(out, list);
	    byte[] data = http://www.mamicode.com/((ByteArrayOutputStream) out).toByteArray();>
jsp页面：
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href=http://www.mamicode.com/"">>



Jackson.jar的使用记录


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