Java字符串格式化,{}占位符根据名字替换实例

我就废话不多说了，大家还是直接看代码吧~

import java.beans.PropertyDescriptor;
import java.lang.reflect.Method;
import java.util.HashMap;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class StringFormatUtil {

  private static final Pattern pattern = Pattern.compile("\{(.*?)\}");
  private static Matcher matcher;

  
  public static String stringFormat(String sourStr, Map param) {
    String tagerStr = sourStr;
    if (param == null)
      return tagerStr;
    try {
      matcher = pattern.matcher(tagerStr);
      while (matcher.find()) {
 String key = matcher.group();
 String keyclone = key.substring(1, key.length() - 1).trim();
 Object value = param.get(keyclone);
 if (value != null)
   tagerStr = tagerStr.replace(key, value.toString());
      }
    }catch (Exception e){
      return null;
    }
    return tagerStr;
  }

  
  public static String stringFormat(String sourStr, Object obj) {
    String tagerStr = sourStr;
    matcher = pattern.matcher(tagerStr);
    if (obj == null)
      return tagerStr;

    PropertyDescriptor pd;
    Method getMethod;
    // 匹配{}中间的内容 包括括号
    while (matcher.find()) {
      String key = matcher.group();
      String keyclone = key.substring(1, key.length() - 1).trim();
      try {
 pd = new PropertyDescriptor(keyclone, obj.getClass());
 getMethod = pd.getReadMethod();// 获得get方法
 Object value = getMethod.invoke(obj);
 if (value != null)
   tagerStr = tagerStr.replace(key, value.toString());
      } catch (Exception e) {
 // TODO Auto-generated catch block
 // Loggers.addException(e);
      }
    }
    return tagerStr;
  }

  
  public static String stringFormatAll(String sourStr, Map param) {
    String tagerStr = sourStr;
    if (param == null)
      return tagerStr;
    try {
      matcher = pattern.matcher(tagerStr);
      while (matcher.find()) {
 String key = matcher.group();
 String keyclone = key.substring(1, key.length() - 1).trim();
 Object value = param.get(keyclone);
 if (value != null)
   tagerStr = tagerStr.replace(key, value.toString());
      }
    }catch (Exception e){
      return null;
    }
    return tagerStr;
  }

  
  public static String stringFormat(String sourStr, JSonObject param) {
    String tagerStr = sourStr;
    if (param == null)
      return tagerStr;
    try {
      matcher = pattern.matcher(tagerStr);
      while (matcher.find()) {
 String key = matcher.group();
 String keyclone = key.substring(1, key.length() - 1).trim();
 Object value = param.get(keyclone);
 if (value != null)
   tagerStr = tagerStr.replace(key, value.toString());
      }
    }catch (Exception e){
      return null;
    }
    return tagerStr;
  }

  public static void main(String[] args) {
//    Map map = new HashMap<>();
//    map.put("id","111");
//    map.put("sss","ss");
//    JSonObject json = new JSonObject();
//    json.put("id","212");
//    json.put("fff","xxxx");
//    json.put("emmmmm",11);
//    stringFormat("sisas&{fff}_diwahwi%{id}{jio}",json);
  }
}

补充知识：java中占位符的使用

二话不说，先上代码

package com.string.format;

public class StringFormat {
  //占位符%s，拼接sql,删除两个表中的数据，条件是字符串数组类型的id
  public static void formSql(String tableName,String tableName2,String...strings){
    //sql占位符 %s占位符
    String sql="delete from %s,%s where id in (%s)";
    //声明新的字符串
    String sqls="";
    //遍历字符串的参数数组
    for (String str : strings) {
      //将参数数组拼接成字符串，用逗号分割
      sqls += str + ",";
    }
    //拼接最后会多出个逗号，截取
    sqls=sqls.substring(0, sqls.length()-1);
    //format第一个sql参数为目标字符串，tableName,tableName2，为替换的两表的名字，sqls为删除数据的参数集合
    String s=String.format(sql, tableName,tableName2,sqls);
    //输出拼接后的sql
    System.out.println(s);
  }
  public static void main(String[] args) {
    //传入参数为指定表名，和参数值
    StringFormat.formSql("user","role", "1","3","5","7","9","33");
  }
}

其实，传入的参数是数组类型的值，我们也可以按array[0],array[1]的方式插入参数，只是参数个数应用不灵活，还是使用数组的方式取值比较好，

public static void format(){
    String st="%s的%s的价格是%f,是否售罄%c,占总销售的%d%%,库存%d,是否为畅销品%b";
    String s=String.format(st, "58优品","啤酒",3.5,'是',50,199,true);
    System.out.println(s);
  }
  public static void main(String[] args) {
    //传入参数为指定表名，和参数值
    //StringFormat.formSql("user","role", "1","3","5","7","9","33");
    format();
  }

public static void format(){
    //String st="%s的%s的价格是%f,是否售罄%c,占总销售的%d%%,库存%d,是否为畅销品%b";
    //String s=String.format(st, "58优品","啤酒",3.5,'是',50,199,true);
    //System.out.println(s);
    SimpleDateFormat simple=new SimpleDateFormat("yyyy年MM月dd日 HH点mm分ss秒");
    String newDate=simple.format(new Date());
    String st1="%s的%s的价格是%s,是否售罄%s,占总销售的%s%%,库存%s,是否为畅销品%s,当前日期为%s";
    String ss=String.format(st1, "58优品","啤酒","3.5",'是',"80","998","true",newDate);
    
    System.out.println(ss);
  }
  public static void main(String[] args) {
    //传入参数为指定表名，和参数值
    //StringFormat.formSql("user","role", "1","3","5","7","9","33");
    format();
  }

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Java字符串格式化,{}占位符根据名字替换实例

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