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VTD XML查找重影/不存在路径时出现java错误

我有一块XML,如下所示,其中包含3个attachmentBinary元素(尽管为了可读性被截断):

  <MyRequest>
      <MojNumber>219</MojNumber>
      <AttachmentBinary fileExtension="image/jpeg">/9j/4UK8RXhpZgAASUkqAAgAAAAMAAABBAABAAAAAAoAAAEBBAABAAAAAAABABAgAJAAAApgAAABIBAwABAAAAAQAAABoBBQABAAAAsAAAABsBBQABAAAgAAADEBAgAOAAAAwAAAADIBAgAUAAAAzgAAABMCAwABAAAAAQAAAGmHBA</AttachmentBinary>                                   
      <AttachmentBinary fileExtension="image/jpeg">/9j/4UE1RXhpZgAASUkqAAgAAAAMAAABBAABAAAAAAoAAAEBBAABAAAAAA5QCMg7udvGabszG8hX5M5JZhk/SrFvuV0Q7dmx87s4c8LUlwrRqrKWyBl</AttachmentBinary>
      <AttachmentBinary fileExtension="image/jpeg">/9j/4SfRRXhpZgAASUkqAAgAAAAMAAABBAABAAAAAAoAAAEBBAABAAAAAASTwcU+GZSThd3y4J6GpAm8ysxDmQALk71A9hVKTvcznHS5gSh2LSgkEgyG</AttachmentBinary>
      </MyRequest>

首先提取fileExtension和主Base64编码jpg的VTD-XML Java代码如下:

try {
                        ap.selectXPath("/MyRequest/AttachmentBinary/text()");
                    } catch (XPathParseException e2) {
                        // TODO Auto-generated catch block
                        e2.printStackTrace();
                    }

                int i = 0;

                while ((i = ap.evalXPath()) != -1) {
                    // i points to text node of
                        String ext  = vn.toString(vn.getAttrVal("fileExtension"));
                     System.out.println("ext is:"+ ext);

                     String s = vn.toRawString(i);
}

然而,我得到的是6支安打,而不是3支安打。其中只有3张可以看到图像


共 (1) 个答案

  1. # 1 楼答案

    xpath请求一个没有属性节点的文本节点。。。所以您应该使用/MyRequest/AttachmentBinary,即不带text()。。。那就没事了

    但是要获取text(),需要调用getText()并确保它不是-1