struts2獲取請求參數的三種方式及傳遞給JSP參數的方式

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package test;import com.opensymphony.xwork2.ActionSupport;
import javax.servlet.http.*;
import org.apache.struts2.ServletActionContext;
import com.opensymphony.xwork2.ActionContext;
import java.util.*;
public class HelloAction extends ActionSupport {public String jname = "";public String jid = "";@Overridepublic String execute() throws Exception {// TODO Auto-generated method stubreturn super.execute();}private String str = "";public String hello() {this.str = "hello!!!";System.out.println("方法一，把參數作為Action的類屬性,讓OGNL自動填充：");System.out.println("jname:" + jname + "  jid:" + jid);ActionContext context=ActionContext.getContext();  HttpServletRequest request = (HttpServletRequest)context.get(ServletActionContext.HTTP_REQUEST);System.out.println("方法二，在Action中取得HttpServletRequest對象，使用request.getParameter獲取參數");System.out.println("jname:" + request.getParameter("jname") + "  jid:" + request.getParameter("jid"));Map  parameterMap=context.getParameters();    String bookName2[]=(String[])parameterMap.get("jname");    String bookPrice2[]=(String[])parameterMap.get("jid");    System.out.println("方法三，在Action中使用ActionContext得到parameterMap獲取參數：");    System.out.println("jname: " +bookName2[0]);    System.out.println("jid: " +bookPrice2[0]);  return "success";}public String getStr() {return str;}public void setStr(String str) {this.str = str;}public String getJname() {return jname;}public void setJname(String jname) {this.jname = jname;}public String getJid() {return jid;}public void setJid(String jid) {this.jid = jid;}
}

總結：?

方法一：當把參數作為Action的類屬性，且提供屬性的getter/setter方法時，xwork的OGNL會自動把request參數的值設置到類屬性中，此時訪問請求參數只需要訪問類屬性即可。?
方法二：可以通過ActionContext對象Map ?parameterMap=context.getParameters();方法，得到請求參數Map，然后通過parameterMap來獲取請求參數。需要注意的是：當通過parameterMap的鍵取得參數值時，取得是一個數組對象，即同名參數的值的集合。?
方法三：通過ActionContext取得HttpServletRequest對象，然后使用request.getParameter("參數名")得到參數值。

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參考：http://www.cnblogs.com/bmbm/archive/2011/11/28/2342273.html