方法1：写一个SERVLET

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public class ShowPictureServlet extends HttpMsgConnector {

    private static final long serialVersionUID = 1L;

    private final static Logger logger = Logger.getLogger(ShowPictureServlet.class.getSimpleName());

    @Override
    public void execute(HttpServletRequest req, HttpServletResponse res) throws Exception {
        String imagePath = req.getParameter(FSConstant.PARAM_PATH);
        String module = req.getParameter(FSConstant.PARAM_MODULE);
        logger.debug("----------Getting image path--->" + imagePath);
        logger.debug("----------Getting module name--->" + module);

        OutputStream os = res.getOutputStream();
        if(StringUtils.isNotEmpty(imagePath) && StringUtils.isNotEmpty(module)) {
            imagePath = getPrePath(Modules.valueOf(module)) + imagePath;
            imagePath = imagePath.replace("/", File.separator).replace("\\", File.separator);
            logger.debug("----------Image real path is--->" + imagePath);
            InputStream imageIn = new FileInputStream(new File(imagePath));
            
            if(imagePath.toLowerCase().endsWith(".png")) {
                res.setContentType("image/png;charset=utf-8");
            } else if(imagePath.toLowerCase().endsWith(".jpg")){
                res.setContentType("image/jpeg;charset=utf-8");
            } else {
                res.setContentType("image/gif;charset=utf-8");
            }
            BufferedInputStream bis = new BufferedInputStream(imageIn);
            BufferedOutputStream bos = new BufferedOutputStream(os);
            byte data[] = new byte[4096];
            int size = 0;
            size = bis.read(data);
            while(size != -1) {
                bos.write(data, 0, size);
                size = bis.read(data);
            }
            bis.close();
            bos.flush();
            bos.close();
        } else {
            logger.warn("----------No parameter of image path or module name received from mobile client--->");
        }
        os.flush();
        os.close();
    }

    private String getPrePath(Modules moduleType) {
        switch (moduleType) {
        case SERVICE:
            return FSConstant.SERVICE_PATH;
        case REWARDS:
            return FSConstant.REWARDS_PATH;
        case PROMOTION:
            return FSConstant.PROMOTION_PATH;
        case RESTAURANT:
            return FSConstant.RESTAURANT_IMAGE_PATH;
        case COMMENTARY:
            return FSConstant.RESTAURANT_COMMENTARY_PATH;
        default:
            logger.error("----------Error module name--->" + moduleType.name());
            return null;
        }
    }

}

?简单解释一下，参数imagePath是存放在数据库中的图片相对路径，module是模块名，根据这两个参数可以获取当前图片的真实路径。

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下面是在web.xml里的配置：

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       <servlet>
	    <servlet-name>ShowImageServlet</servlet-name>
    	<servlet-class>com.molisc.mobileserver.core.connection.ShowPictureServlet</servlet-class>
  	</servlet>
        <servlet-mapping>
		<servlet-name>ShowImageServlet</servlet-name>
		<url-pattern>/ShowImage.action</url-pattern>
	</servlet-mapping>

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使用方法参考如下：

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http://localhost:8080/testapp/ShowImage.action?model=SERVICE&path=/20110403/a.png

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方法二：在TOMCAT/JBOSS中添加一个Context

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<Context path="/picContext" docBase="/home/leozhou/apps/test"/>

?其中/home/leozhou/apps/test是我的图片存放路径。

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使用方法参考如下：

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http://localhost:8080/picContext/20110403/a.png

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