ajax传递list集合

一：ajax传递List类型的数据

js代码：

//声明list
var _list = [];
//放入string对象
for (var i = 0; i < 3; i++) {
	_list[i]="tom";
}

$.ajax({
	url : '/ajax/test',
	data : "list="+_list,
	type : "POST",
	success : function(data) {
		alert(data);
	}
});

java代码：

@RequestMapping(value="test",method=RequestMethod.POST)
@ResponseBody
public String ajaxList(@RequestParam("list")List strList){
		
	for (String str : strList) {
		System.out.println(str);
	}
	return "OK";
}

二：ajax传递List类型的数据

后台需要用到json解析工具，我选得是jackson

导入jackson依赖：

	com.fasterxml.jackson.core
	jackson-databind
	2.7.3

js代码：

//声明list
var _list = [];
//创建两个user对象
var a= {};
a.name="tom";
a.age=23;
a.city="上海";
var b = {};
b.name="jack";
b.age=25;
a.city="安徽";
//将user放入_list
_list.push(a);
_list.push(b);

$.ajax({
	url : '/ajax/test1',
	data : "list="+JSON.stringify(_list),
	type : "POST",
	success : function(data) {
		alert(data);
	}
});

java代码：

@RequestMapping(value="test",method=RequestMethod.POST)
@ResponseBody
public String ajaxList(@RequestParam("list")String userList) throws Exception{
	//jackson对象
	ObjectMapper mapper = new ObjectMapper();
	//使用jackson将json转为List
	JavaType jt = mapper.getTypeFactory().constructParametricType(ArrayList.class, User.class);   
	List list =  (List)mapper.readValue(userList, jt);
		
	return "OK";
}

三：当ajax传递任何复杂参数时，后台可以直接从流中来读取数据进行解析

js代码：

//声明list
var _list = [];
//创建两个user对象
var	a= {};
a.name="tom";
a.age=23;
a.city="上海";
var b = {};
b.name="jack";
b.age=25;
a.city="安徽";
//将user放入_list
_list.push(a);
_list.push(b);

$.ajax({
	url : '/querz/test',
	data : JSON.stringify(_list),//这里需要json化
	type : "POST",
	success : function(data) {
		alert(data);
	}
});

java代码：

@RequestMapping(value="test",method=RequestMethod.POST)
@ResponseBody
public String ajaxList(HttpServletRequest request) throws Exception{
	
	//从流中读取数据
	BufferedReader br = request.getReader();
	String str = "";
	StringBuffer sb = new StringBuffer();
	while((str = br.readLine()) != null){
		sb.append(str);
	}
		
	ObjectMapper mapper = new ObjectMapper();
	//使用jackson解析数据
	JavaType jt = mapper.getTypeFactory().constructParametricType(ArrayList.class, User.class);   
	List list =  (List)mapper.readValue(sb.toString(), jt); 
	System.out.println(list);
		
	return "OK";
}