struts2中 jsp页面 空文本框传值 及action层不同类型的判断

struts2可以自动转换jsp前台传来的信息格式

前台jsp

</pre><pre name="code" class="html"><form action="user_setInfo" method="post">  名字<input type="text" value="" name="name"/><br/>  日期<input type="text" value="" name="date"/><br/>  年龄<input type="text" value="" name="age"/><br/>  颜色1<input type="text" value="" name="color"/><br/>  颜色2<input type="text" value="" name="color"/><br/> 尺寸1 <input type="text" value="" name="size"/><br/>  尺寸2<input type="text" value="" name="size"/><br/>  <input type="submit" value="提交"/>  </form>

后台action

package action;import java.util.Date;import java.util.List;import javax.servlet.http.HttpServletRequest;import org.apache.struts2.ServletActionContext;import com.opensymphony.xwork2.ActionSupport;public class UserAction extends ActionSupport{/** * 952740499 */private static final long serialVersionUID = 1L;private String name;private Date date;private List<String> color;private String [] size;private int age;public String setInfo() {System.out.println("名字*****"+name);System.out.println("日期*****"+date);System.out.println("颜色*****"+color.get(0)+"*****"+color.get(1));System.out.println("尺寸*****"+size[0]+"****"+size[1]);System.out.println("年龄******"+age);return "info";}public String getName() {return name;}public void setName(String name) {this.name = name;}public Date getDate() {return date;}public void setDate(Date date) {this.date = date;}public List<String> getColor() {return color;}public void setColor(List<String> color) {this.color = color;}public String[] getSize() {return size;}public void setSize(String[] size) {this.size = size;}public int getAge() {return age;}public void setAge(int age) {this.age = age;}}

</pre><pre name="code" class="java">提交后输出

</pre><pre name="code" class="java"><img src="http://img.blog.csdn.net/20151107124451402?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQv/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center" alt="" />

struts2当前台空文本框时 后台action的拍段，不同类型不一样

1.当前台jsp中 input 的那么中 没有后台action的属性名，除int类型外 则接受到判断用 xx==null，int类型用xx==0

2 . 当name和action中属性名匹配时

      

  

<span style="color:#ff0000;">//为对象（除Object外）时用xx==null//当为String或Object时用xx.equls("")//当为int时用 xx==0</span>private String name;private Date date;//date==nullprivate List<String> color;//color.get(0).equals("")private Object [] size;//oject 使用equals("")private int age;//age==0public String setInfo() {System.out.println("名字*****"+name.equals(""));System.out.println(date==null);System.out.println(color.get(0).equals(""));System.out.println("颜色"+color);System.out.println(size[0].equals(""));System.out.println("大小"+size);System.out.println(age==0);return "info";}public String getName() {return name;}public void setName(String name) {this.name = name;}public Date getDate() {return date;}public void setDate(Date date) {System.out.println("ddddddddddddddddddd");//虽然date为null但是会调用this.date = date;}public List<String> getColor() {return color;}public void setColor(List<String> color) {this.color = color;}public Object[] getSize() {return size;}public void setSize(Object[] size) {this.size = size;}public int getAge() {return age;}public void setAge(int age) {this.age = age;}