Struts2 结合HttpClient 实现远程服务器文件下载

1、只实现远程文件下载未处理远程服务器连接失败的状态

1.1、页面配置部分

下载模板

1.2、Struts2配置文件部分

文件下载.xls

application/vnd.ms-excel
attachment;filename=”${downloadName}”
downloadFile
4096

1.3、Action层中获取远程服务器文件流程序部分

public class ImportAction{

private String downFileName; 
private String downloadName;

IFileService fileService;

/**
* @param fileService the fileService to set
*/
public void setEztFileService(IFileService fileService) {
this.fileService = fileService;
}

/**
* @return the downFileName
*/
public String getDownFileName() {
return downFileName;
}

/**
* @param downFileName the downFileName to set
*/
public void setDownFileName(String downFileName) {
this.downFileName = downFileName;
}

/**
* @return the downloadName
*/
public String getDownloadName() {
return downloadName;
}

/**
* @param downloadName the downloadName to set
*/
public void setDownloadName(String downloadName) {
this.downloadName = downloadName;
}

public InputStream getDownloadFile(){
downloadName = fileService.getDownloadFileName(downFileName); //下载文件显示名称转编码
Properties properties = ResourceUtil.getProperties(“file.properties”);

    //取得远程服务器信息配置属性文件file.properties文件为自定义文件放置在web项目src/conf文件夹下 
    String strRemoteFileUrl = properties.getProperty("serverPath")+ properties.getProperty("templateName");    //取得远程文件路径 
    InputStream in  = fileService.getDownloadFile(strRemoteFileUrl);  //调用Service层方法取得远程服务器文件流 
    return in;    
}

}

1.4、Service层接口实现

public class FileService implements IFileService {

public String getDownloadFileName(String downFileName) { //解决下载文件名称中文乱码问题
try {
downFileName = new String(downFileName.getBytes(), “ISO-8859-1”);
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
return downFileName;
}

public InputStream getDownloadFile(String strRemoteFileUrl) {
// TODO Auto-generated method stub
HttpClient client = new HttpClient();
GetMethod httpGet = new GetMethod(strRemoteFileUrl);
InputStream in = null;
try {
int intResponseCode = client.executeMethod(httpGet);
in = httpGet.getResponseBodyAsStream();
} catch (HttpException e) {
// TODO Auto-generated catch block

        //记录日志 
    } catch (IOException e) { 
        // TODO Auto-generated catch block

        //记录日志 
    }   
    return in;   
}

}

1.5、读取properties文件工具类部分

public class ResourceUtil {
public static Properties getProperties(String fileName) {
try {
Properties properties = new Properties();
ClassLoader cl = Thread.currentThread().getContextClassLoader();
properties.load(cl.getResourceAsStream(fileName));
return properties;
} catch (Exception ex) {
ex.printStackTrace();
}
return null;
}

}

1.6、总结：此项实现，在文件服务器运行正常的情况下文件下载正常，如果文件服务器运行异常或已停止运行则在jsp页面部分将会抛出异常。

2、实现远程服务器文件下载并处理文件服务器连接异常，返回提示信息

2.1、页面配置部分

${meg}

下载模板

2.2、Struts2配置文件部分

文件下载.xls

application/vnd.ms-excel
attachment;filename=”${downloadName}”
downloadFile
4096

        <result name="error">/com/import/download.jsp</result> 
   </action>

2.3、Action层中获取远程服务器文件流程序部分

public class ImportAction{

private String downFileName; 
private String downloadName;

private InputStream downloadFile;

IFileService fileService;

/**
* @param fileService the fileService to set
*/
public void setEztFileService(IFileService fileService) {
this.fileService = fileService;
}

/**
* @return the downFileName
*/
public String getDownFileName() {
return downFileName;
}

/**
* @param downFileName the downFileName to set
*/
public void setDownFileName(String downFileName) {
this.downFileName = downFileName;
}

/**
* @return the downloadName
*/
public String getDownloadName() {
return downloadName;
}

/**
* @param downloadName the downloadName to set
*/
public void setDownloadName(String downloadName) {
this.downloadName = downloadName;
}

/**
* @return the downloadFile
*/
public InputStream getDownloadFile() {
return downloadFile;
}

/**
* @param downloadFile the downloadFile to set
*/
public void setDownloadFile(InputStream downloadFile) {
this.downloadFile = downloadFile;
}

    //取得远程服务器信息配置属性文件file.properties文件为自定义文件放置在web项目src/conf文件夹下 
    String strRemoteFileUrl = properties.getProperty("serverPath")+ properties.getProperty("templateName");    //取得远程文件路径 
    downloadFile  = fileService.getDownloadFile(strRemoteFileUrl);  //调用Service层方法取得远程服务器文件流变量名称与配置文件相符 
    if (null==downloadFile) { 
        request.setAttribute("meg", "模板下载异常！"); 
        return ERROR; 
    } else { 
        return SUCCESS; 
    }    
}

}

2.4、Service层接口实现

public class FileService implements IFileService {

        //记录日志 
    } catch (IOException e) { 
        // TODO Auto-generated catch block

        //记录日志 
    }   
    return in;   
}

}

2.5、读取properties文件工具类部分

}

2.6、总结：此项实现，在文件服务器运行正常的情况下文件下载正常，如果文件服务器运行异常则将返回下载页面并提示异常信息。

Struts2 结合HttpClient 实现远程服务器文件下载

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