Ajax获取显示Json数据的一种方法

本文主要是在java中用json与前台Ajax数据交互

1、首先前台用Ajax，其中注意dataType一定要选择json方式，Action成功返回给页面的Json内容是这样的[{"number":"V006","names":"LiLei"}],可见comment['names']对应"names":"LiLei"，comment['number']对应"number":"V006"。

			$.ajax({
				type: "post",
				 url:'apply/mystudent.action?',
				cache: false,
				dataType : "json",
				success: function(data){
					
					$.each(data, function(commentIndex, comment){
                 
                        alert("姓名"+ comment['names']);
               
                        alert("学号"+comment['number']);

                  });
		                               }
	                               }); 	

2、Ajax的URL指向在java的action中mystudent方法，返回的list其实是一个对象Student，包括了names和nunmber字段

	public String mystudent() throws Exception{
		List list=priceService.query();//调用接口实现类
		
		this.jsonUtil(list);
		
		return null;
	}

3、action页面专门写一个方法jsonUtil来做为json方法

	// 调用json工具方法，传入参数alist
	public void jsonUtil(Object accountlist) throws Exception {
		HttpServletResponse response = ServletActionContext.getResponse();
		log.info("JSON格式：" + accountlist.toString());

		String returnJson = JsonConvert.returnJson(accountlist);
		response.setCharacterEncoding("utf-8");
		response.getWriter().println(returnJson);
	}

4、我用的是一种比较新的json包jackson

import java.io.StringWriter;

import org.codehaus.jackson.map.ObjectMapper;

public class JsonConvert {
	static String jsonStr;
	public static String returnJson(Object object) throws Exception{
		ObjectMapper objectMapper = new ObjectMapper();
		StringWriter stringWriter = new StringWriter();
		objectMapper.writeValue(stringWriter, object);
		
		jsonStr = stringWriter.toString();
		return jsonStr;
	}
}