SpringMVC五种类型参数传递和json数据传递参数
【摘要】
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✨系列专栏：👉SpringMVC注解开发
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🔥欢迎大佬指正，一起 学习！一起加油！
学习内容：
- 1.普通参数
-
url地址传参，地址参数名与形参变量名相同，定义形参即可接收参数
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请求参数名与形参变量名不同，使用@RequestParam绑定参数@RequestParam- 类型:形参注解
- 位置: SpringMVC控制器方法形参定义前面
- 作用:绑定请求参数与处理器方法形参间的关系
- 参数:
- required:是否为必传参数
- defaultValue:参数默认值
-
@RequestMapping("/commonParam")
@ResponseBody
public String commonParam(@RequestParam("name")String username,int age){
System.out.println("普通参数传递name:"+username);
System.out.println("普通参数传递age:"+age);
return "'module':'common param'";
}
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- 2.pojo参数
- 请求参数名与形参对象属性名相同，定义pojo类型形参即可接收参数
- 3.嵌套pojo
- 请求参数名与形参对象属性名相同，按照对象层次结构关系即可接收嵌套pojo属性参数
- 4.数组参数
- 请求参数名与形参对象属性名相同且请求参数有多个，定义数组类型形参即可接收参数
- 5.集合参数
- 请求参数名与形参对象属性名相同且请求参数有多个，使用@RequestParam绑定参数
- 6.解决中文乱码
Post请求中文乱码处理- 为web容器添加过滤器并指定字符集，Spring-web包中提供了专用的字符过滤器
protected Filter[] getServletFilters() {
CharacterEncodingFilter filter = new CharacterEncodingFilter();
filter.setEncoding("UTF-8");
return new Filter[]{filter};
}
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- 7.json数据传递参数
@EnablewebMvc- 类型:配置类注解
- 位置: SpringMVc配置类定义上方
- 作用:开启SpringMVC多项辅助功能， 开启自动转换json数据的支持，由json数据转换为对象的功能
@Configuration
@ComponentScan("com.study.controller")
@EnablewebMvc
public class SpringMvcConfig {
}
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@RequestBody- 类型:形参注解
- 位置:SpringMVC控制器方法形参定义前面
- 作用:将请求中请求体所包含的数据传递给请求参数，此注解一个处理器方法只能使用一次
@RequestMapping("/pojos")
@ResponseBody
public String pojosParam(@RequestBody User user){
System.out.println("pojos参数传递user:"+user);
return "'module':'pojos.....'";
}
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案例分析：
1.pom.xml
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>org.example</groupId>
<artifactId>SpringMVC-Demo1</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>war</packaging>
<dependencies>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>5.2.22.RELEASE</version>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>4.0.1</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.13.3</version>
</dependency>
</dependencies>
</project>
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2.ServletContainersInitConfig
package com.study.config;
import org.springframework.web.filter.CharacterEncodingFilter;
import org.springframework.web.servlet.support.AbstractAnnotationConfigDispatcherServletInitializer;
import javax.servlet.Filter;
public class ServletContainersInitConfig extends AbstractAnnotationConfigDispatcherServletInitializer {
@Override
protected Class<?>[] getRootConfigClasses() {
return new Class[0];
}
@Override
protected Class<?>[] getServletConfigClasses() {
return new Class[]{SpringMvcConfig.class};
}
@Override
protected String[] getServletMappings() {
return new String[]{"/"};
}
@Override
protected Filter[] getServletFilters() {
CharacterEncodingFilter filter = new CharacterEncodingFilter();
filter.setEncoding("UTF-8");
return new Filter[]{filter};
}
}
/*
public class ServletContainersInitConfig extends AbstractDispatcherServletInitializer {
//加载SpringMVC容器配置
@Override
protected WebApplicationContext createServletApplicationContext() {
AnnotationConfigWebApplicationContext ctx = new AnnotationConfigWebApplicationContext();
ctx.register(SpringMvcConfig.class);
return ctx;
}
//设置哪些请求可以归属SpringMVC处理
@Override
protected String[] getServletMappings() {
return new String[]{"/"};
}
//加载Spring容器配置
@Override
protected WebApplicationContext createRootApplicationContext() {
AnnotationConfigWebApplicationContext ctx = new AnnotationConfigWebApplicationContext();
ctx.register(SpringConfig.class);
return ctx;
}
}*/
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3.SpringMvcConfig
package com.study.config;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
@Configuration
@ComponentScan("com.study.controller")
public class SpringMvcConfig {
}
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4.UserController
package com.study.controller;
import com.study.domain.User;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import java.util.Arrays;
import java.util.List;
@Controller
public class UserController {
//1.普通参数传递
@RequestMapping("/commonParam")
@ResponseBody
public String commonParam(String name,int age){
System.out.println("普通参数传递name:"+name);
System.out.println("普通参数传递age:"+age);
return "'module':'common param'";
//http://localhost:8080/SpringMVC_Demo3/commonParam?name=tom&age=13 普通参数传递name:jack 普通参数传递age:13
}
//2.pojo参数传递
@RequestMapping("/pojo")
@ResponseBody
public String pojoParam(User user){
System.out.println("pojo参数传递user:"+user);
return "'module':'pojo.....'";
//http://localhost:8080/SpringMVC_Demo3/pojo?name=%E5%B0%8F%E9%A3%9E%E4%BE%A0&age=13
//pojo参数传递user:User{name='小飞侠', age=13}
}
// 3.嵌套pojo参数
@RequestMapping("/pojos")
@ResponseBody
public String pojosParam(User user){
System.out.println("pojos参数传递user:"+user);
return "'module':'pojos.....'";
//http://localhost:8080/SpringMVC_Demo3/pojos?name=%E5%B0%8F%E9%A9%AC%E5%93%A5&age=13&address.province=%E6%B2%B3%E5%8D%97&address.city=%E5%95%86%E4%B8%98
//pojo参数传递user:User{name='小马哥', age=13, address=Address{province='河南', city='商丘'}}
}
//4.数组参数传递
@RequestMapping("/arr")
@ResponseBody
public String array(String [] arr){
System.out.println("数组参数传递arr:"+ Arrays.toString(arr));
return "'module':'array.....'";
//http://localhost:8080/SpringMVC_Demo3/arr?arr=1&arr=2&arr=3
//数组参数传递arr:[1, 2, 3]
}
//5.集合参数
@RequestMapping("/coll")
@ResponseBody
public String collection(@RequestParam List<String> colls){
System.out.println("集合参数传递colls:"+colls);
return "'module':'collection.....'";
//http://localhost:8080/SpringMVC_Demo3/coll?colls=1&colls=2&colls=3
//集合参数传递colls:[1, 2, 3]
}
//6.pojo参数：json格式
@RequestMapping("/json")
@ResponseBody
public String json(User user) throws JsonProcessingException {
ObjectMapper objectMapper = new ObjectMapper();
String json = objectMapper.writeValueAsString(user);
System.out.println(json);
return "'module':'json.....'";
//http://localhost:8080/SpringMVC_Demo3/json?name=小马哥&age=23&address.province=河南&address.city=商丘
//{"name":"小马哥","age":23,"address":{"province":"河南","city":"商丘"}}
}
}
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5.Address
package com.study.domain;
public class Address {
private String province;
private String city;
public String getProvince() {
return province;
}
public void setProvince(String province) {
this.province = province;
}
public String getCity() {
return city;
}
public void setCity(String city) {
this.city = city;
}
@Override
public String toString() {
return "Address{" +
"province='" + province + '\'' +
", city='" + city + '\'' +
'}';
}
}
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6.User
package com.study.domain;
public class User {
private String name;
private int age;
private Address address;
public Address getAddress() {
return address;
}
public void setAddress(Address address) {
this.address = address;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
@Override
public String toString() {
return "User{" +
"name='" + name + '\'' +
", age=" + age +
", address=" + address +
'}';
}
}
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文章来源: blog.csdn.net，作者：不会压弯的小飞侠，版权归原作者所有，如需转载，请联系作者。
原文链接：blog.csdn.net/qq_43514330/article/details/125578156
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