ajax传递list集合

一：ajax传递List<String>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<String> strList){

for (String str : strList) {
System.out.println(str);
}
return "OK";
}

二：ajax传递List<Obj>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：

<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.7.3</version>
</dependency>

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<User>
JavaType jt = mapper.getTypeFactory().constructParametricType(ArrayList.class, User.class);
List<User> list = (List<User>)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<User> list =  (List<User>)mapper.readValue(sb.toString(), jt);
System.out.println(list);

return "OK";
}