本篇文章給大家帶來的內容是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，希望對你們有所幫助。

1 查詢參數

請求格式：url?參數1=值1&參數2=值2...

同時適用于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// 查詢參數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;

}

方法二：

從HttpServletRequest中提取參數// 查詢參數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;

}

方法三：

方法參數名和請求參數名可以不一樣，通過@RequestParam注解來綁定參數// 查詢參數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;

}

方法四：

創建一個實體類對象作為參數承載體，spring會根據參數名稱自動將參數綁定到實體類對象的屬性上// 查詢參數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;

}

實體類定義如下：@Data

@NoArgsConstructor

@AllArgsConstructor

@Builderpublic class User {

private String username;

private String password;

}

這里用到了第三方庫lombok，這樣就不需要在代碼中手動添加get、set等方法，lombok會自動添加。

發送請求的curl命令如下：curl -i 'http://192.168.1.14:8080/test/query1?username=aaa&password=bbb'

交互報文如下：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

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...

適用于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注解中將method方法設置成POST方法

方法一：// 表單參數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;

}

方法二：// 表單參數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;

}

方法三：// 表單參數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;

}

方法四：// 表單參數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;

}

curl請求命令如下：curl -X POST -i -d "username=aaa&password=bbb" http://192.168.1.14:8080/test/form1

請求和響應報文如下：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

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...

同時適用于GET和POST方式

代碼如下：@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;

}

請求curl命令如下：curl -i http://192.168.1.14:8080/test/url/aaa/bbb

請求和響應報文如下：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

4 json格式參數

請求參數在Body體中，并且為json格式。需要添加請求頭：Content-Type: application/json;charset=UTF-8

適用于POST方式

方法一：

定義實體類，將json對象解析成實力類，需要添加RequestBody注解// json參數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;

}

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// json參數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;

}

方法三：

也可以將json對象直接解析成Map對象// json參數3

@RequestMapping(value = "/test/json3", method = RequestMethod.POST)

public String testJson3(@RequestBody Map userMap) {

String username = userMap.get("username");

String password = userMap.get("password");

System.out.println("username=" + username + ", password=" + password);

return "username=" + username + ", password=" + password;

}

請求curl命令如下：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

請求和響應報文如下：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

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