commonhttpparser.java

实现了从Google

package com.ct.hotweb.util;

import java.io.*;
import java.util.*;

public class CommonHttpParser implements HttpParser {

  public CommonHttpParser() {
  }

  /**
   * 根据所提供的模板,分析获取的html源文件
   * @param httpContent String
   * @param partKey String
   * @param block BlockAnalyzer
   * @throws Exception
   * @return ArrayList
   */
  public ArrayList parse(String httpContent,
                       String partKey,
                       BlockAnalyzer block) throws Exception {
    httpContent = prepare(httpContent, partKey);
    ArrayList vars = new ArrayList();

    int posStart = -1, posEnd = 0;
    while ((posStart = httpContent.indexOf(partKey, posStart + 1)) >= 0) {
      String blockStr = "";
      posEnd = httpContent.indexOf(partKey, posStart + 1);
      if (posEnd >= 0) {
        blockStr = httpContent.substring(posStart + partKey.length(), posEnd);
      } else {
        blockStr = httpContent.substring(posStart + partKey.length(), httpContent.length() - 1);
      }
      HashMap hm = parseBlock(blockStr, block);
      if (0 != hm.size()) {
        vars.add(hm);
      }
    }
    /*
    String blockStr = httpContent.substring(posStart + partKey.length(), httpContent.length() - 1);
    HashMap hm = parseBlock(blockStr, block);
    if (0 != hm.size()) {
      vars.add(hm);
    }*/
    return vars;
  }

  String prepare(String httpContent, String partKey) {
    BufferedReader br = new BufferedReader(new StringReader(httpContent));
    StringBuffer sb = new StringBuffer();
    String line;
    try {
      while ((line = br.readLine()) != null)
        sb.append(line.trim()).append("\n");
      br.close();
      httpContent = sb.toString();
    } catch (Exception e) {
      e.printStackTrace();
    }
    //ignor the first part
    int pos = httpContent.indexOf(partKey);
    if (pos < 0) return "";
    httpContent = httpContent.substring(pos, httpContent.length() - 1);
    return httpContent;
  }

  /**
   * 分析块
   * @param blockStr String
   * @param block BlockAnalyzer
   * @return HashMap
   */
  HashMap parseBlock(String blockStr, BlockAnalyzer block) {
    HashMap result = new HashMap();
    int i = 0, posStart, posEnd = 0;

    for (i = 0; i < block.getVars().size(); i ++) {
      String str1 = (String)(block.getStrings().get(i));
      String str2 = (String)block.getStrings().get(i + 1);
      String varValue = "";

      posStart = blockStr.indexOf(str1, posEnd) + str1.length();
      if (posStart < str1.length()) {
        result.clear();
        return result;
      }
      posEnd = blockStr.indexOf(str2, posStart);
      if (posEnd < 0) {
        result.clear();
        return result;
      };
      varValue = blockStr.substring(posStart, posEnd);

      VariableInfo vi = (VariableInfo)(block.getVars().get(i));
      String varsName = vi.getVariableName();
      result.put(varsName, varValue);
    }
    return result;
 }

}