Structs错误显示问题
我的页面有一个username控件.我想在validate验证失败后把错误打在username控件的右面.现在能打印出来.但是我资原文件中写的是{0} can not be empty. 我想要的结果是username can not be empty 可是显示的是{0} can not be empty 请问如何把{0}用username替换啊.昨天还会的.过一天就忘了.高手帮个忙.


ActionForm:

Java code

package c1;import javax.servlet.http.HttpServletRequest;import org.apache.struts.action.ActionErrors;import org.apache.struts.action.ActionForm;import org.apache.struts.action.ActionMapping;import org.apache.struts.action.ActionMessage;public class LoginActionForm extends ActionForm {  private String username;    public String getUsername() {    return username;  }  public void setUsername(String username) {    this.username = username;  }  @Override  public ActionErrors validate(ActionMapping mapping, HttpServletRequest request) {    if ("".equals(this.getUsername()) || this.username == null) {      ActionErrors ae = new ActionErrors();      ActionMessage am = new ActionMessage("error.eng");      ae.add("username", am);      return ae;    } else {      return super.validate(mapping, request);    }  }}

Structs_config.xml :

XML code

<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE struts-config SYSTEM "struts-config_1_1.dtd"><struts-config>  <form-beans>    <form-bean name="login" type="c1.LoginActionForm"></form-bean>  </form-beans>  <action-mappings>    <action path="/c1/main" name="login" type="c1.LoginAction" input="/c1/test1.jsp" validate="true">          </action>  </action-mappings>  <message-resources parameter="resource"></message-resources></struts-config>

resource.properties:
error.eng = {0} can not empty


[解决办法]
ActionMessage am = new ActionMessage("error.eng");
应该写为：
ActionMessage am = new ActionMessage("error.eng", username);

要把占位符对应的username变量加进去才行。