spring mvc 数据绑定入门

1：基本数据类型key 是必传的并且必须类型一致

// http://localhost:8080/bind/baseType.do?xage=10

@RequestMapping(value = "/baseType.do")
@ResponseBody
public String baseType(@RequestParam("xage") int age) {
    return "age:" + age;
}

2：包装数据类型key 是不是必须传入的

/ http://localhost:8080/bind/baseType2.do?age=10@RequestMapping(value = "/baseType2.do")

@ResponseBody
public String baseType2(Integer age) {
    return "age:" + age;
}

3：数组类型绑定

http://localhost:8080/bind/array.do?name=Tom&name=Lucy

@RequestMapping(value = "/array.do")
@ResponseBody
public String array(String[] name) {

    StringBuilder stringBuilder = new StringBuilder();

    for (String item : name) {
        stringBuilder.append(item).append(" ");
    }
    return stringBuilder.toString();
}

4：简单对象绑定

public class Admin {

    private String name;

    private Integer age;
}

public class User {

    private String name;

    private Integer age;

    private ContactInfo contactInfo;

}

http://localhost:8080/bind/object.do?name=Tom&age=10
 http://localhost:8080/bind/object.do?name=Tom&age=10&contactInfo.phone=10086&contactInfo.address=1

@RequestMapping(value = "/object.do")
@ResponseBody
public String object(User user, Admin admin) {

    return user.toString() + "   " + admin.toString();
}

5：简单对象绑定扩展到不同对象的相同属性名

http://localhost:8080/bind/object.do?user.name=Tom&
        user.age=10&contactInfo.phone=10086&
        contactInfo.address=1&admin.name=Lucy&admin.age=15

添加如下bind

@InitBinder("user")
public void initUser(WebDataBinder binder) {
    binder.setFieldDefaultPrefix("user.");
}

@InitBinder("admin")
public void initAdmin(WebDataBinder binder) {
    binder.setFieldDefaultPrefix("admin.");
}

6:List对象绑定

public class UserListForm {
private List<User> users;
}

http://127.0.0.1:8080/bind/list.do?users[0].name=Tom&users[1].name=Lucy
http://127.0.0.1:8080/bind/list.do?users[0].name=Tom&users[20].name=Lucy

@RequestMapping(value = "list.do")
@ResponseBody
public String list(UserListForm userListForm) {
return "listsize:" + userListForm.getUsers().size() + userListForm.toString();
}

7：map对象绑定

public class UserMapForm {

private Map<String,User> users;
}
http://127.0.0.1:8080/bind/map.do?users['x'].name=Tom&users['x'].age=10&users['y'].name=Lucy

@RequestMapping(value = "map.do")
@ResponseBody
public String map(UserMapForm userMapForm) {
return userMapForm.toString();

}

8：Json类型数据绑定

{
"name":"Jim",
"age":16,
"contactInfo":{
"address":"beijing",
"phone":"10010"
}
}

@RequestMapping(value = "json.do")
@ResponseBody
public String map(@RequestBody User user) {
    return user.toString();

}

需要引入

<dependency>
    <groupId>org.codehaus.jackson</groupId>
    <artifactId>jackson-mapper-asl</artifactId>
    <version>${org.codehaus.jackson.version}</version>
</dependency>