springmvc jsp显示服务器图片

麻烦各位老师指导下，我想实现jsp显示照片功能。
我的图片是存放在Tomcat\webapps一个目录下，前台jsp查询到数据库存图片的URL路径，
jsp问题代码如下：



${item.imageUrl }
${item.imageLink }
${item.createtime }
${item.createperson }

查询报错：
 Note: further occurrences of HTTP request parsing errors will be logged at DEBUG level.

java.lang.IllegalArgumentException: Invalid character found in the request target. The valid characters are defined in RFC 7230 and RFC 3986
at org.apache.coyote.http11.Http11InputBuffer.parseRequestLine(Http11InputBuffer.java:467)
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:294)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:764)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1388)
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Unknown Source)

九月 23, 2018 9:49:56 下午 org.apache.coyote.http11.Http11Processor service
信息: Error parsing HTTP request header
Note: further occurrences of HTTP request parsing errors will be logged at DEBUG level.
java.lang.IllegalArgumentException: Invalid character found in the request target. The valid characters are defined in RFC 7230 and RFC 3986
at org.apache.coyote.http11.Http11InputBuffer.parseRequestLine(Http11InputBuffer.java:467)
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:294)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:764)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1388)
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Unknown Source)

我已经找到原因，src需要使用GET而不是Post，后来因图片存放在tomcat服务器目录下，我直接在xml中配置了映射关系，前台JSP直接获取到了。

https://blog.csdn.net/cwzhsi/article/details/43417357

controller方法如下：
@RequestMapping(value="getpic", method = RequestMethod.POST, produces = {"application/vnd.ms-excel;charset=UTF-8"})

public String getpic(String path, HttpServletResponse response) throws IOException {
System.out.println("path:"+path);
response.setContentType("image/jpeg/jpg/png/gif/bmp/tiff/svg"); // 设置返回内容格式

path=new String(path.getBytes("ISO-8859-1"),"UTF-8");
File file = new File(path); //括号里参数为文件图片路径

if(file.exists()){ //如果文件存在

InputStream in = new FileInputStream(path); //用该文件创建一个输入流

OutputStream os = response.getOutputStream(); //创建输出流

byte[] b = new byte[1024];

while( in.read(b)!= -1){

os.write(b);

}

in.close();

os.flush();

os.close();

}

return null;

}

        我在这个方法加断点，debug不进，先报错：
        信息: Error parsing HTTP request header

Note: further occurrences of HTTP request parsing errors will be logged at DEBUG level.
java.lang.IllegalArgumentException: Invalid character found in the request target. The valid characters are defined in RFC 7230 and RFC 3986
at org.apache.coyote.http11.Http11InputBuffer.parseRequestLine(Http11InputBuffer.java:467)
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:294)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:764)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1388)
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Unknown Source)

jsp代码如下：

        <tr class="result-table-head">
            <th style="width:80px;"><input type="checkbox" onclick="checkAll(this)" id="all"/>全选</th>
            <th style="width:300px;">url</th>

        </tr>
        <c:forEach items="${itemsList }" var="item">
            <tr>
                <td style="width:80px;"><input type="checkbox" name="items_id" onclick="selectProduct()"value="${item.id}" /></td>
                <td style="width:300px;">${item.imageUrl }</td>
                <td style="width:100px;">${item.imageLink }</td>
                <td style="width:100px;">${item.createtime }</td>
                <td style="width:100px;">${item.createperson }</td>
                <td style="width:100px;">
                       <img style="width:100%;" src="getpic.api?path=${item.imageUrl }" />                  </td>
            </tr>
        </c:forEach>