spring ajax前后端传递复杂参数

1、简单数据：

1.1 前端传递参数：

$.ajax({
type: "post",
url: "${pageContext.request.contextPath}/send",
data: {
messageContent: "世界",
messageType: "1",
},
success: function(data) {
alert("消息已发送。");
}
});

1.2  后端接受参数：

方式1：controller方法参数形式：

@ResponseBody
@RequestMapping(value = "/send", method = RequestMethod.POST)
public void sendMessage(HttpServletRequest request, HttpServletResponse response, String messageContent, Integer messageType) {
System.out.println(messageContent);
}

方式2：在方法体内通过 request.getParameter：

String messageContent= request.getParameter("messageContent");

2. 传递单个对象：

2.1 前端：

传递的chatGroups是个对象

$.ajax({
type: "post",
url: "${pageContext.request.contextPath}/send",
data: {
messageContent: messageContent,
messageType: messageType,
chatGroups: JSON.stringify({
"chatGroupId": "22808545525762",
"chatGroupName": "陕西省",
"avatar": "chatuserlogo/4006df745d3d40e591220614c69b6ac6.png"
})
}, // 以json字符串方式传递,
success: function(data) {
alert("消息已发送。");
},
error: function(message) {
alert("消息发送失败：" + message);
}
});

chatGroups 也可以单独定义出来：

var chatGroups = {
"chatGroupId": "22808545525762",
"chatGroupName": "陕西省",
"avatar": "chatuserlogo/4006df745d3d40e591220614c69b6ac6.png"
}

此时data部分为：

data: {
messageContent: messageContent,
messageType: messageType,
chatGroups: JSON.stringify(chatGroups) // 以json字符串方式传递,
}

2.2 后端：

首先定义一个对应的java类

public class MessageToChatGroup {
private String chatGroupId;
private String chatGroupName;
private String avatar;
}controller：

@ResponseBody
@RequestMapping(value = "/send", method = RequestMethod.POST)
public String sendMessage(HttpServletRequest request, HttpServletResponse response,
String messageContent, Integer messageType, String chatGroups) {
MessageToChatGroup messageToChatGroup = JSON.parseObject(chatGroups, MessageToChatGroup.class);
System.out.println(messageToChatGroup.getChatGroupName());
}

打印：陕西省

3、传递数组：

3.1 前端：

var chatGroups = [
{
"chatGroupId": "22627604299779",
"chatGroupName": "中国",
"avatar": "chatuserlogo/4006df745d3d40e591220614c69b6ac6.png"
},
{
"chatGroupId": "22808545525762",
"chatGroupName": "陕西省",
"avatar": "chatuserlogo/4006df745d3d40e591220614c69b6ac6.png"
}
]
$.ajax({
type: "post",
url: "${pageContext.request.contextPath}/send",
data: {
messageContent: messageContent,
messageType: messageType,
chatGroups: JSON.stringify(chatGroups) // 以json字符串方式传递
},
success: function(data) {
alert("消息已发送。");
}
});

将要传递的json对象chatGroups通过

JSON.stringify(chatGroups)

转化为字符串提交。

3.2 后端：

首先定义一个与上面复杂json对象对应的java类：

public class RequestChatGroup {
private String chatGroupId;
private String chatGroupName;
private String avatar;
}

controller层：

@ResponseBody
@RequestMapping(value = "/send", method = RequestMethod.POST)
public void sendMessage(HttpServletRequest request, HttpServletResponse response,
String messageContent, Integer messageType, String chatGroups) {

List<RequestChatGroup> requestChatGroups = new ArrayList<RequestChatGroup>(); // 定义一个list
requestChatGroups = JSONObject.parseArray(chatGroups, RequestChatGroup.class); // 将前端传递的json字符串chatGroups转化为list

System.out.println(requestChatGroups.get(0).getChatGroupName());
}

针对上面的字符串会打印： 中国