ajax傳遞list集合

一：ajax傳遞List<String>類型的數據

js代碼：

//聲明list
var _list = [];
//放入string對象
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代碼：
@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傳遞List<Obj>類型的數據後台需要用到json解析工具，我選得是jackson

導入jackson依賴：

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

js代碼：
//聲明list
var _list = [];
//創建兩個user對象
var a= {};
a.name="tom";
a.age=23;
a.city="上海";
var b = {};
b.name="jack";
b.age=25;
a.city="安徽";
//將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代碼：
@RequestMapping(value="test",method=RequestMethod.POST)
@ResponseBody
public String ajaxList(@RequestParam("list")String userList) throws Exception{
//jackson對象
ObjectMapper mapper = new ObjectMapper();
//使用jackson將json轉為List<User>
JavaType jt = mapper.getTypeFactory().constructParametricType(ArrayList.class, User.class);
List<User> list = (List<User>)mapper.readValue(userList, jt);

return "OK";
}

三：當ajax傳遞任何複雜參數時，後台可以直接從流中來讀取數據進行解析

js代碼：

//聲明list
var _list = [];
//創建兩個user對象
var a= {};
a.name="tom";
a.age=23;
a.city="上海";
var b = {};
b.name="jack";
b.age=25;
a.city="安徽";
//將user放入_list
_list.push(a);
_list.push(b);

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

java代碼：

@RequestMapping(value="test",method=RequestMethod.POST)
@ResponseBody
public String ajaxList(HttpServletRequest request) throws Exception{

//從流中讀取數據
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解析數據
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";
}

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