如何使用Apache Commons從servlet上傳文件來上傳文件？

Question

我需要從服務器端上傳xml文件，其中文件的內容在字符串中。 如何使該文件內容上載（基本上保存）在服務器上？

這是我正在嘗試的方法，如果我直接將文件提供給FileBody但又如何欺騙它使文件內容作為多部分請求進入另一個servlet，則可以正常工作？

private def createConfiguration(def sessiontoken)
{
    def xmlString=""
    HttpClient httpclient = new DefaultHttpClient();
    try {

        HttpPost httppost = new HttpPost(fileParams.create);

        //FileBody bin = new FileBody(new File("C:\\Simon\\myxml.xml"));
        StringBody st = new StringBody(sessiontoken);
        StringBody cfgname = new StringBody(reqParams.c_Cfgname[0]);
        StringBody cfgdesc = new StringBody(reqParams.c_Cfgdesc[0]);
        StringBody cfgtype = new StringBody(reqParams.c_Cfgtype[0]);
        StringBody cfgfile = new StringBody(reqParams.CFGFILE[0]);

        MultipartEntity reqEntity = new MultipartEntity();
        reqEntity.addPart("sessiontoken", st);
        reqEntity.addPart("cfgname", cfgname);
        reqEntity.addPart("cfgdesc", cfgdesc);
        reqEntity.addPart("cfgenv", cfgtype);
        //reqEntity.addPart("cfgfile", bin);
        reqEntity.addPart("cfgfile", cfgfile);

        httppost.setEntity(reqEntity);

        System.out.println("executing request " + httppost.getRequestLine());
        HttpResponse response = httpclient.execute(httppost);
        HttpEntity resEntity = response.getEntity();

        System.out.println("----------------------------------------");
        //System.out.println(response.getStatusLine());
        if (resEntity != null) {
            //System.out.println("Response content length: " + resEntity.getContentLength());
            xmlString=resEntity.getContent().getText()
        }
        EntityUtils.consume(resEntity);
    } finally {
        try { httpclient.getConnectionManager().shutdown(); } catch (Exception ignore) {}
    }
    xmlString
}

如果使用上面的代碼，則會出現以下異常

----------------------------------------



Exception while processing your Request.
No result defined for action com.abc.dc.actions.CreateConfiguration and
 result input

更新資料

因此，現在在檢查了tomcat日志和其他服務器端代碼之后，我知道內部dc正在獲取cfgfile並將其設置為

public void setCfgfile(File cfgfile)
{
    this.cfgfile = cfgfile
}

這給了我

java.lang.NoSuchMethodException: com.abc.dc.actions.CreateConfiguration.setCfgfile([Ljava.lang.String;)

那么如何在public void setCfgfile(String cfgfile)重載setCfgfile方法並將cfgfile轉換為File對象呢？

甚至更好

如何將此cfgfile字符串變量轉換為FileBody對象？

Answer 1

最后，這就是我的工作方式：)

private def sendRequest(def sessiontoken,def sendUrl)
{
    logger.debug("Inside sendRequest to: "+sendUrl)
    def xmlString=""
    HttpClient httpclient = new DefaultHttpClient();
    try {

        HttpPost httppost = new HttpPost(sendUrl);

        def filename=reqParams.filename
        logger.debug("Filename: "+filename)
        FileBody bin = new FileBody(writeToFile(filename,reqParams.cfgfile));
        StringBody st = new StringBody(sessiontoken);
        StringBody cfgid=new StringBody("")
        if(reqParams.containsKey('cfgfile')&&reqParams.cfgid!=null)
        {
            cfgid= new StringBody(reqParams.cfgid);
        }

        StringBody cfgname = new StringBody(reqParams.cfgname);
        StringBody cfgdesc = new StringBody(reqParams.cfgdesc);
        StringBody cfgenv = new StringBody(reqParams.cfgenv);

        logger.debug("attaching multipart")
        MultipartEntity reqEntity = new MultipartEntity();
        reqEntity.addPart("sessiontoken", st);
        reqEntity.addPart("cfgid", cfgid);
        reqEntity.addPart("cfgname", cfgname);
        reqEntity.addPart("cfgdesc", cfgdesc);
        reqEntity.addPart("cfgenv", cfgenv);
        reqEntity.addPart("cfgfile", bin);

        httppost.setEntity(reqEntity);

        HttpResponse response = httpclient.execute(httppost);
        HttpEntity resEntity = response.getEntity();

        if (resEntity != null) {
            xmlString=resEntity.getContent().getText()
        }
        EntityUtils.consume(resEntity);
    } finally {
        try { httpclient.getConnectionManager().shutdown(); } catch (Exception ignore) {}
    }
    xmlString
}