nosum-spring/src/main/java/cn/nosum/framework/mvc/v4/servlet/View.java

package cn.nosum.framework.mvc.v4.servlet;

import cn.nosum.util.StringUtils;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.RandomAccessFile;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * Created by Tom.
 */
public class View {

    private File viewFile;
    public View(File templateFile) {
        this.viewFile = templateFile;
    }

    public void render(Map<String, ?> model, HttpServletRequest req, HttpServletResponse resp) throws Exception {
        StringBuffer sb = new StringBuffer();
        RandomAccessFile ra = new RandomAccessFile(this.viewFile,"r");

        String line = null;
        while (null != (line = ra.readLine())){
            line = new String(line.getBytes("ISO-8859-1"),"utf-8");
            Pattern pattern = Pattern.compile("￥\\{[^\\}]+\\}",Pattern.CASE_INSENSITIVE);
            Matcher matcher = pattern.matcher(line);
            while (matcher.find()){
                String paramName = matcher.group();
                paramName = paramName.replaceAll("￥\\{|\\}","");
                String paramValue = StringUtils.getString(model.get(paramName),"");
                line = matcher.replaceFirst(makeStringForRegExp(paramValue));
                matcher = pattern.matcher(line);
            }
            sb.append(line);
        }
        resp.setCharacterEncoding("utf-8");
        resp.getWriter().write(sb.toString());
    }

    //处理特殊字符
    public static String makeStringForRegExp(String str) {
        return str.replace("\\", "\\\\").replace("*", "\\*")
                .replace("+", "\\+").replace("|", "\\|")
                .replace("{", "\\{").replace("}", "\\}")
                .replace("(", "\\(").replace(")", "\\)")
                .replace("^", "\\^").replace("$", "\\$")
                .replace("[", "\\[").replace("]", "\\]")
                .replace("?", "\\?").replace(",", "\\,")
                .replace(".", "\\.").replace("&", "\\&");
    }
}