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[Java教程]Struts2学习笔记(六)——Action处理请求参数

在struts2框架中关于Action处理请求参数有两种方案(三个方式),表单属性的名称应该和在Action类中定义的成员属性或者在JavaBean中定义的成员属性名称一样:

1、属性驱动

  1)直接在Action类中定义成员属性来接收请求参数 (将Action当成javaBean),在Action中还需要定义成员属性的setter方法。

表单信息:

1 <form action="${pageContext.servletContext.contextPath}/testAction.action">2   name:<input type="text" name="name"><br>3   password:<input type="password" name="password"><br>4   <input type="submit" value="提交">5 </form>

Action类:

 1 public class TestAction { 2   private String name; 3   private String password; 4    5   public String getName() { 6     return name; 7   } 8  9   public void setName(String name) {10     this.name = name;11   }12 13   public String getPassword() {14     return password;15   }16 17   public void setPassword(String password) {18     this.password = password;19   }20 21   public String execute() {22     System.out.println("name: " + name);23     System.out.println("password: " + password);24     return "success";25   }26 }

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  2)直接将javaBean做为Action的属性,在页面上必须使用ognl表达式来描述组件的name属性

1 username:<input type="text" name="user.username"><br>

JavaBean:

 1 public class Person { 2   private String name; 3   private String password; 4  5   public String getName() { 6     return name; 7   } 8   public void setName(String name) { 9     this.name = name;10   }11   public String getPassword() {12     return password;13   }14   public void setPassword(String password) {15     this.password = password;16   }17 }

表单信息:

1 <form action="${pageContext.servletContext.contextPath}/testAction.action">2   name:<input type="text" name="person.name"><br>3   password:<input type="password" name="person.password"><br>4   <input type="submit" value="提交">5 </form>

Action:

 1 public class TestAction { 2   private Person person; 3    4   public Person getPerson() { 5     return person; 6   } 7  8   public void setPerson(Person person) { 9     this.person = person;10   }11 12   public String execute() {13     System.out.println("name: " + person.getName());14     System.out.println("password: " + person.getPassword());15     return "success";16   }17 }

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这种方式是通过name="params"的拦截器实现参数封装的。

1 <interceptor name="params" class="com.opensymphony.xwork2.interceptor.ParametersInterceptor"/>

2、模型驱动

模型驱动处理请求参数的步骤为:

步骤:

  • 1.Action必须实现ModelDriven接口
  • 2.重写getModel()方法,返回一个javaBean对象.
  • 3.实例化一个javaBean对象.

JavaBean:

 1 public class Person { 2   private String name; 3   private String password; 4   public String getName() { 5     return name; 6   } 7   public void setName(String name) { 8     this.name = name; 9   }10   public String getPassword() {11     return password;12   }13   public void setPassword(String password) {14     this.password = password;15   }16 }

表单信息:

1 <form action="${pageContext.servletContext.contextPath}/testAction.action">2   name:<input type="text" name="name"><br>3   password:<input type="password" name="password"><br>4   <input type="submit" value="提交">5 </form>

Action:

 1 public class TestAction implements ModelDriven { 2   private Person person = new Person(); 3    4   public Person getPerson() { 5     return person; 6   } 7  8   public void setPerson(Person person) { 9     this.person = person;10   }11 12   public String execute() {13     System.out.println("name: " + person.getName());14     System.out.println("password: " + person.getPassword());15     return "success";16   }17 18   @Override19   public Object getModel() {20     return person;21   }22 }

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4、封装数据到Collection或数组

JavaBean:

 1 public class Person { 2   private String name; 3   private String password; 4   public String getName() { 5     return name; 6   } 7   public void setName(String name) { 8     this.name = name; 9   }10   public String getPassword() {11     return password;12   }13   public void setPassword(String password) {14     this.password = password;15   }16 }

表单信息:

1 <form action="${pageContext.servletContext.contextPath}/testAction.action">2   name1:<input type="text" name="list[0].name"><br>3   password1:<input type="password" name="list[0].password"><hr>4   name2:<input type="text" name="list[1].name"><br>5   password2:<input type="password" name="list[1].password"><br>6   <input type="submit" value="提交">7 </form>

Action:

 1 public class TestAction { 2   private List<Person> list; 3  4   public List<Person> getList() { 5     return list; 6   } 7  8   public void setList(List<Person> list) { 9     this.list = list;10   }11 12   public String execute() {13     System.out.println("name1: " + list.get(0).getName());14     System.out.println("password1: " + list.get(0).getPassword());15     System.out.println("name2: " + list.get(1).getName());16     System.out.println("password2: " + list.get(1).getPassword());17     return "success";18   }19 }

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5、封装数据到Map

JavaBean:

 1 public class Person { 2   private String name; 3   private String password; 4   public String getName() { 5     return name; 6   } 7   public void setName(String name) { 8     this.name = name; 9   }10   public String getPassword() {11     return password;12   }13   public void setPassword(String password) {14     this.password = password;15   }16 }

表单信息:

1 <form action="${pageContext.servletContext.contextPath}/testAction.action">2   name1:<input type="text" name="map['one'].name"><br>3   password1:<input type="password" name="map['one'].password"><hr>4   name2:<input type="text" name="map['two'].name"><br>5   password2:<input type="password" name="map['two'].password"><br>6   <input type="submit" value="提交">7 </form>

Action:

public class TestAction {  private Map<String, Person> map;  public Map<String, Person> getMap() {    return map;  }  public void setMap(Map<String, Person> map) {    this.map = map;  }  public String execute() {    System.out.println("name1: " + map.get("one").getName());    System.out.println("password1: " + map.get("one").getPassword());    System.out.println("name2: " + map.get("two").getName());    System.out.println("password2: " + map.get("two").getPassword());    return "success";  }}

 

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