奇怪的字符（）行为与SAX+；JAVA

在我的XML中有一个多行元素：

<tag id="sometag" ...>
    | first line
    |     second line
    |         third line
    |     fourth line
<tag ...>
....
<tag id="someothertag" ...>
    | ANOTHER FIRST LINE
    |     ANOTHER SECOND LINE
    |         ANOTHER THIRD LINE
    |     ANOTHER FORTH LINE
<tag ...>

除此之外，我对这些角色什么也不做。我基本上创建了两个解析器实例。有一个例子，我正在搜索

sometag

。如果找到要查找的内容并返回该元素，则抛出异常

D/MyProgram( 1565): STARTING document parsing...
D/MyProgram( 1565): characters( "n   ", 0, 1 )
D/MyProgram( 1565): characters( "        | first line", 0, 20 )
D/MyProgram( 1565): characters( "n       | first line", 0, 1 )
D/MyProgram( 1565): characters( "        |   second line", 0, 23 )
D/MyProgram( 1565): characters( "n       |   second line", 0, 1 )
D/MyProgram( 1565): characters( "        |       third line", 0, 26 )
D/MyProgram( 1565): characters( "n       |       third line", 0, 1 )
D/MyProgram( 1565): characters( "        |   fourth lineline", 0, 22 )
D/MyProgram( 1565): characters( "n       |   fourth lineline", 0, 1 )
D/MyProgram( 1565): characters( "        |   fourth lineline", 0, 4 )
D/MyProgram( 1565): Successfully found "sometag"!

…对于另一个全新的实例，我正在搜索

someothertag

。我做了和以前一样的事

D/MyProgram( 1565): STARTING document parsing...
D/MyProgram( 1565): characters( "n", 0, 1 )
D/MyProgram( 1565): characters( "    ", 0, 4 )
D/MyProgram( 1565): characters( "n   ", 0, 1 )
D/MyProgram( 1565): characters( "        | first line", 0, 20 )
D/MyProgram( 1565): characters( "n       | first line", 0, 1 )
D/MyProgram( 1565): characters( "        |   second line", 0, 23 )
D/MyProgram( 1565): characters( "n       |   second line", 0, 1 )
D/MyProgram( 1565): characters( "        |       third line", 0, 26 )
D/MyProgram( 1565): characters( "n       |       third line", 0, 1 )
D/MyProgram( 1565): characters( "        |   fourth lineline", 0, 22 )
D/MyProgram( 1565): characters( "n       |   fourth lineline", 0, 1 )
D/MyProgram( 1565): characters( "        |   fourth lineline", 0, 4 )
D/MyProgram( 1565): Successfully found "someothertag"!

我知道XML解析是基于流的（它解析块而不是整个字符串），但这是一种非常奇怪的行为。以下是我注意到的一些令人困惑的事情：

• 对于characters（）的每次迭代，解析器并不是从它停止的地方开始，也不是在完成解析时完成字符：我甚至得到了第一个字符数组（“

  n

  ”，它是换行符的替换）之前的字符

• ch

  具有原本不存在的额外字符：“

  行

  ”附加到“

  第四行

  ”
• 当我创建一个全新的解析器实例时，字符被“重新读取”。第二次执行应该是这样的：

……这

D/MyProgram( 1565): characters( "n", 0, 1 )
D/MyProgram( 1565): characters( "    ", 0, 4 )
D/MyProgram( 1565): characters( "n   ", 0, 1 )
D/MyProgram( 1565): characters( "        | ANOTHER FIRST LINE", 0, 20 )
D/MyProgram( 1565): characters( "n       |     ANOTHER SECOND LINE", 0, 1 )

。。。等等

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知道我做错了什么吗？提前感谢。

正如Margulies所说，您没有在传递的字符数组中使用

start

和

length

public void characters(char[] ch, int start, int length) {
    // use only the indicated segment.
    String str = new String( ch, start, length);  
    Log.d(TAG, "characters( "\"" + str.replaceAll("[\r\n]", "\\n") + "\", " + start + ", " + length + " )");
}

---

看起来您没有考虑开始和长度。我遇到的另一个问题是解析器的字符串生成器是静态的。我需要使用builder.setLength（）重置它。

public void characters(char[] ch, int start, int length) {
    // use only the indicated segment.
    String str = new String( ch, start, length);  
    Log.d(TAG, "characters( "\"" + str.replaceAll("[\r\n]", "\\n") + "\", " + start + ", " + length + " )");
}