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
# 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