struts2的action在处理完了业务后，会返回一个字符串，在xml文件面定义字符串与返回页面的关联，便可方便返回页面．但struts2缺少一个方便直接的返回字符串的方法.现在以微信为订阅号成为开发者为例,说明解决方法(集成一个类好可)：
方法１：直接在action中书写:
/**
* 处理微信服务器请求，get请求验证token，post请求是消息
*/
public String execute(){
System.out.println("weixin----------OpenPlatformServiceAction execute-------");
String method = ServletActionContext.getRequest().getMethod();
logger.debug("method="+method);
try {
if(method.equals("POST")){
jsonString = doRequest();
logger.debug("post request complete");
}else{
if (validateToken()) {
jsonString = echostr;
System.out.println("echostr="+echostr);
HttpServletResponse response = ServletActionContext.getResponse();
HttpServletRequest request = ServletActionContext.getRequest();
response.setContentType("text/plain; charset=UTF-8");
response.setHeader("Content-Disposition", "inline");
PrintWriter writer = null;
try {
writer = response.getWriter();
writer.write(jsonString);
}catch(Exception e){
e.printStackTrace();
} finally {
if (writer != null) {
writer.flush();
writer.close();
}
}
}else {
jsonString = "validate fail";
}
//logger.debug("get request complete");
}
} catch (Exception e) {
e.printStackTrace();
}
return "openResult";
}
/**
* 验证token,只在微信验证平台调用接口时会验证一次
* @return
* @throws EntityException
*/
private boolean validateToken() throws EntityException{
System.out.println("weixin----------OpenPlatformServiceAction validateToken-------");
logger.debug("validate token...");
String[] str = { getToken(), timestamp, nonce };
System.out.println("Token="+ getToken()+",timestamp="+timestamp+",nonce="+nonce+",signature="+signature);
Arrays.sort(str); // 字典序排序
String connStr = str[0] + str[1] + str[2];
System.out.println("connStr="+connStr);
// SHA1加密
String digest = encode("SHA1", connStr);
System.out.println("digest="+digest);
// 确认请求来至微信
if (digest.equals(signature)) {
System.out.println("validate success");
//logger.debug("validate success,query string:"+ServletActionContext.getRequest().getQueryString());
return true;
}
//logger.debug("validate fail,query string:"+ServletActionContext.getRequest().getQueryString());
return false;
}
2,第二种：添加一个工具类
/**
* 扩展Struts2返回类型,直接返回String
*
* @author Carmack Created on 2009-3-24 下午03:36:32
*/
public class StringResult extends ServletRedirectResult {
/**
* @author Carmack Created on 2009-3-24 下午03:36:24
*/
private static final long serialVersionUID = -2800270132418148253L;
private static final Logger LOG = LoggerFactory.getLogger(StringResult.class);
public StringResult(){
super();
}
public StringResult(String location){
super(location);
}
public void doExecute(String finalLocation, ActionInvocation invocation) throws Exception {
HttpServletResponse response = (HttpServletResponse) invocation.getInvocationContext().get(HTTP_RESPONSE);
HttpServletRequest request = (HttpServletRequest) invocation.getInvocationContext().get(HTTP_REQUEST);
response.setContentType("text/plain; charset=UTF-8");
response.setHeader("Content-Disposition", "inline");
PrintWriter writer = null;
try {
writer = response.getWriter();
writer.write(request.getAttribute(finalLocation).toString());
} catch(NullPointerException e) {
if(finalLocation.equals("")){
LOG.warn("未指定value",e);
}else{
LOG.error("空",e);
}
} finally {
if (writer != null) {
writer.flush();
writer.close();
}
}
}
}
在Action上使用：
@Results({ @Result(name = "strResult" , type=StringResult.class, value="testStr")})
在方法中先给testStr赋值,返回直接返回sttrResult就OK啦.
testStr = "测试返回字符串123abc"; return "strResult";