Java 获取Web项目相对webapp地址

例如，

import java.io.File;
import java.io.FileInputStream;

import javax.servlet.http.HttpServletRequest;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;

import com.aisino.qysds.common.constant.ERRORConstants;
import com.aisino.qysds.common.exception.SysException;

/**
 * 获取相对项目Web-app 下的路径的文件
 * @author wdh
 *
 */
public class WebUtil {

    public static String getWebPath(){
        String line = File.separator;
        ServletRequestAttributes aRequestAttributes=(ServletRequestAttributes)RequestContextHolder.getRequestAttributes();
        HttpServletRequest request =aRequestAttributes==null?null:aRequestAttributes.getRequest();
        String webpath=request.getServletContext().getRealPath("/")+line;
        return webpath;
    }

}

获取webapp下  execl 文件

String line = File.separator;
File file = new File(webUtil.getWebpath()+line+"excel"+line+"文件名.xls");