java宏解析器
java宏解析器
提问于 2010-07-20 04:52:24
你好，我是一个爪哇新手。
我正在尝试写一个宏解析器，我有一个字符串，它被表示为
String s = '{object.attribute}' --> result of the resolver should be 'attribute'
String prefix = '{object.'
String suffix = '}'这很简单。
我还想扩展到使用相同的解析器来解决以下问题
String s = 'attrName1=$attrValue1$;&attrName2=$attrValue2$;' --> result of the resolver should be attrName1=attrValue1;&attrName2=attrValue2;
String prefix = '$'
String suffix = '$'我可以将泛化的前缀和后缀传递给该方法，但不确定逻辑应该是什么。
public class StringMacro {
/**
* @param args
*/
public static void main(String args[]) {
String s = "{article.article_type}";
String prefix = "{article.";
String suffix = "}";
int prefixLength = prefix.length();
int suffixLength = suffix.length();
int startIndex = s.indexOf("{article.");
int prevEndIndex =startIndex+s.indexOf(suffix);
StringBuffer output = new StringBuffer();
while (startIndex != -1 ) {
output.append(s.substring(startIndex+prefixLength,prevEndIndex));
int endIndex = s.indexOf(suffix,startIndex);
if ( endIndex == -1 ) {
output.append(s.substring(startIndex));
break;
}
String macro = s.substring(startIndex+prefixLength,endIndex-1);
prevEndIndex = endIndex+suffixLength;
startIndex = s.indexOf(prefix, prevEndIndex);
}
System.out.println(">>>"+output);
}}
请帮帮我！
回答 1
Stack Overflow用户
发布于 2010-07-20 22:44:39
这可能会起作用。
public static void main(String args[]) {
String s = "attr1=$attr1Value$&attr2=$attr2Value$Test"String;
String prefix = "$";
String suffix = "$";
String s1 = "{obj.attr}";
String prefix1 = "{obj";
String suffix1 = "}";
int prefixIndex = 0;
int startIndex = 0;
int endIndex = 0;
Map map = new HashMap();
map.put("attr1Value", "100W");
map.put("attr2Value", "123W");
map.put("attr", "columnist");
StringBuffer buffer = new StringBuffer();
while(prefixIndex != -1){
prefixIndex = s.indexOf(prefix, prefixIndex);
endIndex = s.indexOf(suffix, prefixIndex+prefix.length());
buffer.append(s.substring(startIndex, prefixIndex));
if(endIndex == -1){
break;
}
System.out.println(s.substring(prefixIndex+prefix.length(), endIndex));
buffer.append(map.get(s.substring(prefixIndex+prefix.length(), endIndex)));
prefixIndex = s.indexOf(prefix, endIndex+suffix.length());
startIndex= endIndex+suffix.length();
}
if(prefixIndex == -1){
buffer.append(s.substring(endIndex+suffix.length()));
}
System.out.println(buffer);
}}
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原文链接：
https://stackoverflow.com/questions/3284989
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