本篇文章帶給大家的內容是java詳解Spring接收web請求參數的方式 。有一定的參考價值，有需要的朋友可以參考一下，希望對你們有幫助。
1 查詢參數
請求格式：url?參數1=值1&參數2=值2...
同時適用於GET和POST方式
spring處理查詢參數的方法又有幾種寫法：
方法一：
方法參數名即為請求參數名稱
// 查询参数1
@RequestMapping(value = "/test/query1", method = RequestMethod.GET)
public String testQuery1(String username, String password) {
System.out.println("username=" + username + ", password=" + password);
return "username=" + username + ", password=" + password;
}登入後複製
方法二：
從HttpServletRequest中提取參數
// 查询参数2
@RequestMapping(value = "/test/query2", method = RequestMethod.GET)
public String testQuery2(HttpServletRequest request) {
String username = request.getParameter("username");
String password = request.getParameter("password");
System.out.println("username=" + username + ", password=" + password);
return "username=" + username + ", password=" + password;
}登入後複製
方法三：
方法參數名和請求參數名可以不一樣，透過@RequestParam註解來綁定參數
// 查询参数3
@RequestMapping(value = "/test/query3", method = RequestMethod.GET)
public String testQuery3(@RequestParam("username") String un, @RequestParam("password") String pw) {
System.out.println("username=" + un + ", password=" + pw);
return "username=" + un + ", password=" + pw;
}登入後複製
方法四：
建立一個實體類別物件作為參數承載載體，spring會根據參數名稱自動將參數綁定到實體類別物件的屬性上
// 查询参数4
@RequestMapping(value = "/test/query4", method = RequestMethod.GET)
public String testQuery4(User user) {
String username = user.getUsername();
String password = user.getPassword();
System.out.println("username=" + username + ", password=" + password);
return "username=" + username + ", password=" + password;
}登入後複製
實體類別定義如下：
@Data
@NoArgsConstructor
@AllArgsConstructor
@Builderpublic class User {
private String username;
private String password;
}登入後複製
這裡用到了第三方函式庫lombok，這樣就不需要在程式碼中手動加入get、set等方法，lombok會自動加入。
傳送請求的curl指令如下：
curl -i 'http://192.168.1.14:8080/test/query1?username=aaa&password=bbb'
登入後複製
互動封包如下：
GET /test/query1?username=aaa&password=bbb HTTP/1.1
Host: 192.168.1.14:8080
User-Agent: curl/7.58.0
Accept: */*HTTP/1.1 200
Content-Type: text/plain;charset=UTF-8
Content-Length: 26
Date: Thu, 25 Oct 2018 07:01:30 GMT
username=aaa, password=bbb
登入後複製
2 表單參數
請求參數不在url中，而是在Body體中，格式為：url?參數1=值1&參數2=值2...
適用於POST方式
#表單參數處理方法和前面的請求參數處理方法幾乎完全一樣，只是RequestMethod註解中將method方法設定成POST方法
方法一：
// 表单参数1
@RequestMapping(value = "/test/form1", method = RequestMethod.POST)
public String testForm1(String username, String password) {
System.out.println("username=" + username + ", password=" + password);
return "username=" + username + ", password=" + password;
}登入後複製
方法二：
// 表单参数2
@RequestMapping(value = "/test/form2", method = RequestMethod.POST)
public String testForm2(HttpServletRequest request) {
String username = request.getParameter("username");
String password = request.getParameter("password");
System.out.println("username=" + username + ", password=" + password);
return "username=" + username + ", password=" + password;
}登入後複製
方法三：
// 表单参数3
@RequestMapping(value = "/test/form3", method = RequestMethod.POST)
public String testForm3(@RequestParam("username") String un, @RequestParam("password") String pw) {
System.out.println("username=" + un + ", password=" + pw);
return "username=" + un + ", password=" + pw;
}登入後複製
方法四：
// 表单参数4
@RequestMapping(value = "/test/form4", method = RequestMethod.POST)
public String testForm4(User user) {
String username = user.getUsername();
String password = user.getPassword();
System.out.println("username=" + username + ", password=" + password);
return "username=" + username + ", password=" + password;
}登入後複製
curl請求指令如下：
curl -X POST -i -d "username=aaa&password=bbb" http://192.168.1.14:8080/test/form1
登入後複製
請求與回應訊息如下：
POST /test/form1 HTTP/1.1
Host: 192.168.1.14:8080
User-Agent: curl/7.58.0
Accept: */*
Content-Length: 25
Content-Type: application/x-www-form-urlencoded
username=aaa&password=bbbHTTP/1.1 200
Content-Type: text/plain;charset=UTF-8
Content-Length: 26
Date: Thu, 25 Oct 2018 07:05:35 GMT
username=aaa, password=bbb
登入後複製
3 路徑參數
請求參數為url中的一部分，格式為：url/參數1/參數2...
同時適用於GET和POST方式
程式碼如下：
@RequestMapping(value = "/test/url/{username}/{password}", method = RequestMethod.GET)
public String testUrl(@PathVariable String username, @PathVariable String password) {
System.out.println("username=" + username + ", password=" + password);
return "username=" + username + ", password=" + password;
}登入後複製
請求curl指令如下：
curl -i http://192.168.1.14:8080/test/url/aaa/bbb
登入後複製
請求與回應封包如下：
GET /test/url/aaa/bbb HTTP/1.1
Host: 192.168.1.14:8080
User-Agent: curl/7.58.0
Accept: */*HTTP/1.1 200
Content-Type: text/plain;charset=UTF-8
Content-Length: 26
Date: Thu, 25 Oct 2018 07:07:44 GMT
username=aaa, password=bbb
登入後複製
4 json格式參數
請求參數在Body體中，並且為json格式。需要新增請求頭：Content-Type: application/json;charset=UTF-8
適用於POST方式
方法一：
定義實體類，將json物件解析成實力類，需要新增RequestBody註解
// json参数1
@RequestMapping(value = "/test/json1", method = RequestMethod.POST)
public String testJson1(@RequestBody User user) {
String username = user.getUsername();
String password = user.getPassword();
System.out.println("username=" + username + ", password=" + password);
return "username=" + username + ", password=" + password;
}登入後複製
方法二：
如果不像定義實體類，也可以將json請求直接解析成JSONObject類別
// json参数2
@RequestMapping(value = "/test/json2", method = RequestMethod.POST)
public String testJson2(@RequestBody JSONObject json) {
String username = json.getString("username");
String password = json.getString("password");
System.out.println("username=" + username + ", password=" + password);
return "username=" + username + ", password=" + password;
}登入後複製
方法三：
也可以將json物件直接解析成Map物件
// json参数3
@RequestMapping(value = "/test/json3", method = RequestMethod.POST)
public String testJson3(@RequestBody Map<String, String> userMap) {
String username = userMap.get("username");
String password = userMap.get("password");
System.out.println("username=" + username + ", password=" + password);
return "username=" + username + ", password=" + password;
}登入後複製
請求curl指令如下：
curl -X POST -i -H 'Content-Type: application/json;charset=UTF-8' -d '{
"username" : "aaa",
"password" : "bbb"
}
'http://192.168.1.14:8080/test/json1登入後複製
請求與回應封包如下：
POST /test/json1 HTTP/1.1
Host: 192.168.1.14:8080
User-Agent: curl/7.58.0
Accept: */*
Content-Type: application/json;charset=UTF-8
Content-Length: 52
{
"username" : "aaa",
"password" : "bbb"
}HTTP/1.1 200
Content-Type: text/plain;charset=UTF-8
Content-Length: 26
Date: Thu, 25 Oct 2018 07:09:06 GMT
username=aaa, password=bbb登入後複製
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