Spring_Accepting request input

最新推荐文章于 2024-05-25 01:07:03 发布

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本文介绍了SpringMVC中三种常见的客户端向控制器方法传递数据的方法：查询参数、路径变量及表单提交，并对比了查询参数与路径变量的区别。

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Spring MVC provides several ways that a client can pass data into a controller’s handler method. These include
1. Query parameters
2. Form parameters
3. Path variables

1. Query parameters

/spittles/max=100&count=30

<span style="font-size:14px;">@RequestMapping(method=RequestMethod.GET)
  public List<Spittle> spittles(
      @RequestParam(value="max", defaultValue=MAX_LONG_AS_STRING) long max,
      @RequestParam(value="count", defaultValue="20") int count) {
    return spittleRepository.findSpittles(max, count);
  }</span>

2. Path variables

/spittles/12345

<span style="font-size:14px;">@RequestMapping(value="/{spittleId}", method=RequestMethod.GET)
  public String spittle(
      @PathVariable("spittleId") long spittleId, 
      Model model) {
    model.addAttribute(spittleRepository.findOne(spittleId));
    return "spittle";
  }</span>

两者的区别：

Ideally, the resource being identified (the Spittle) would be identified by the URL path, not by query parameters. As a general rule, query parameters should not be used to identify a resource. A GET request for /spittles/12345 is better than one for /spittles/show?spittle_id=12345. The former identifies a resource to be retrieved. The latter describes an operation with a parameter—essentially RPC over HTTP.

意思是如果是面向资源的就采用Path variables的方式，如果是通过HTTP方式调用后台逻辑的就采用Query parameters方式.

3. Form submit

@RequestMapping(value = "/register", method = POST)
	public String processRegistration(@Valid <strong>Spitter</strong> spitter, Errors errors) {
		if (errors.hasErrors()) {
			return "registerForm";
		}

		spitterRepository.save(spitter);
		return "redirect:/spitter/" + spitter.getUsername();
	}

Spring框架自动将窗体提交的数据转换为Spitter对象。当然Form中的相应属性需要与对象的属性保持一致。

View source code:

<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<%@ page session="false" %>
<html>
  <head>
    <title>Spittr</title>
    <link rel="stylesheet" type="text/css"
      href="<c:url value="/resources/style.css" />" >
  </head>
  <body>
    <h1>Register</h1>
    <form method="POST">
      First Name: <input type="text" name="firstName" /><br/>
      Last Name: <input type="text" name="lastName" /><br/>
      Username: <input type="text" name="username" /><br/>
      Password: <input type="password" name="password" /><br/>
      <input type="submit" value="Register" />
   </form>
  </body>
</html>

Object source code:

package spittr;

import javax.validation.constraints.NotNull;
import javax.validation.constraints.Size;

import org.apache.commons.lang3.builder.EqualsBuilder;
import org.apache.commons.lang3.builder.HashCodeBuilder;
import org.hibernate.validator.constraints.Email;

public class Spitter {

  private Long id;
  
  @NotNull
  @Size(min=5, max=16)
  private String username;

  @NotNull
  @Size(min=5, max=25)
  private String password;
  
  @NotNull
  @Size(min=2, max=30)
  private String firstName;

  @NotNull
  @Size(min=2, max=30)
  private String lastName;
  
  @NotNull
  @Email
  private String email;

  public Spitter() {}
  
  public Spitter(String username, String password, String firstName, String lastName, String email) {
    this(null, username, password, firstName, lastName, email);
  }

  public Spitter(Long id, String username, String password, String firstName, String lastName, String email) {
    this.id = id;
    this.username = username;
    this.password = password;
    this.firstName = firstName;
    this.lastName = lastName;
    this.email = email;
  }

  public String getUsername() {
    return username;
  }

  public void setUsername(String username) {
    this.username = username;
  }

  public String getPassword() {
    return password;
  }

  public void setPassword(String password) {
    this.password = password;
  }

  public Long getId() {
    return id;
  }

  public void setId(Long id) {
    this.id = id;
  }

  public String getFirstName() {
    return firstName;
  }

  public void setFirstName(String firstName) {
    this.firstName = firstName;
  }

  public String getLastName() {
    return lastName;
  }

  public void setLastName(String lastName) {
    this.lastName = lastName;
  }
  
  public String getEmail() {
    return email;
  }
  
  public void setEmail(String email) {
    this.email = email;
  }

  @Override
  public boolean equals(Object that) {
    return EqualsBuilder.reflectionEquals(this, that, "firstName", "lastName", "username", "password", "email");
  }
  
  @Override
  public int hashCode() {
    return HashCodeBuilder.reflectionHashCode(this, "firstName", "lastName", "username", "password", "email");
  }

}