struts2 和 ajax的交互

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struts2的配置

<action name="getyzm" class="com.pwq.GetYZM"> <result name="success" type="stream"> <param name="contentType">text/html</param> <param name="inputName">textStream</param> <param name="bufferSize">1024</param> </result> </action>

jsp的代码如下，定义了一个流type="stream"，返回的是文件，textStream

<script type="text/javascript">function captcha() {var xmlhttp;if(window.XMLHttpRequest){xmlhttp = new XMLHttpRequest();}else {xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");}if(xmlhttp != null) {xmlhttp.onreadystatechange = function() {if (xmlhttp.readyState==4 && xmlhttp.status==200){document.getElementById('testText').innerHTML = xmlhttp.responseText;}}xmlhttp.open("POST", "getyzm.action", true);xmlhttp.send();} else alert("XMLHTTPREQUEST 创建失败！");}</script>

package com.ssh.pwq.util;import java.io.ByteArrayInputStream;import java.io.InputStream;import javax.servlet.http.HttpServletRequest;  import org.apache.struts2.ServletActionContext;import com.opensymphony.xwork2.ActionSupport;public class GetYZM extends ActionSupport{      private InputStream textStream;  public InputStream getTextStream() {return textStream;}public void setTextStream(InputStream textStream) {this.textStream = textStream;}public String execute() throws Exception {HttpServletRequest request = null;request = ServletActionContext.getRequest();String name = (String)request.getSession().getAttribute("code");System.out.println("name=>" + name);textStream = new ByteArrayInputStream(name.getBytes("UTF-8"));          return SUCCESS;     }}

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