guava处理字符串与List之间,字符串与map之间的转换<转>

  1 import static org.junit.Assert.*;
  2 
  3 import java.util.List;
  4 import java.util.Map;
  5 
  6 import org.junit.Test;
  7 
  8 import com.google.common.base.Joiner;
  9 import com.google.common.base.Splitter;
 10 import com.google.common.collect.Lists;
 11 import com.google.common.collect.Maps;
 12 
 13 
 14 public class Guava {
 15 
 16     /**
 17      * list转换为字符串
 18      */
 19     @Test
 20     public void joinTest(){
 21         List<String> names = Lists.newArrayList("John", "Jane", "Adam", "Tom");
 22         String result = Joiner.on(",").join(names);
 23      
 24         assertEquals(result, "John,Jane,Adam,Tom");
 25     }
 26 
 27 
 28     /**
 29      * map转换为字符串
 30      */
 31     @Test
 32     public void whenConvertMapToString_thenConverted() {
 33         Map<String, Integer> salary = Maps.newHashMap();
 34         salary.put("John", 1000);
 35         salary.put("Jane", 1500);
 36         String result = Joiner.on(" , ").withKeyValueSeparator(" = ")
 37                                         .join(salary);
 38         System.out.println(result);
 39     }
 40     
 41     /**
 42      * list转String,跳过null
 43      */
 44     @Test
 45     public void whenConvertListToStringAndSkipNull_thenConverted() {
 46         List<String> names = Lists.newArrayList("John", null, "Jane", "Adam", "Tom");
 47         String result = Joiner.on(",").skipNulls().join(names);
 48         System.out.println(result);
 49         assertEquals(result, "John,Jane,Adam,Tom");
 50     }
 51 
 52     /**
 53      * list转String,将null变成其他值
 54      */
 55     @Test
 56     public void whenUseForNull_thenUsed() {
 57         List<String> names = Lists.newArrayList("John", null, "Jane", "Adam", "Tom");
 58         String result = Joiner.on(",").useForNull("nameless").join(names);
 59         System.out.println(result);
 60         assertEquals(result, "John,nameless,Jane,Adam,Tom");
 61     }
 62     
 63     /**
 64      * String to List
 65      */
 66     @Test
 67     public void whenCreateListFromString_thenCreated() {
 68         String input = "apple - banana - orange";
 69         List<String> result = Splitter.on("-").trimResults().splitToList(input);
 70         System.out.println(result);
 71         //assertThat(result, contains("apple", "banana", "orange"));
 72     }
 73 
 74     /**
 75      * String to Map
 76      */
 77     @Test
 78     public void whenCreateMapFromString_thenCreated() {
 79         String input = "John=first,Adam=second";
 80         Map<String, String> result = Splitter.on(",")
 81                                              .withKeyValueSeparator("=")
 82                                              .split(input);
 83      
 84         assertEquals("first", result.get("John"));
 85         assertEquals("second", result.get("Adam"));
 86     }
 87 
 88     /**
 89      * 多个字符进行分割
 90      */
 91     @Test
 92     public void whenSplitStringOnMultipleSeparator_thenSplit() {
 93         String input = "apple.banana,,orange,,.";
 94         List<String> result = Splitter.onPattern("[.|,]")
 95                                       .omitEmptyStrings()
 96                                       .splitToList(input);
 97         System.out.println(result);
 98     }
 99     
100     /**
101      * 每隔多少字符进行分割
102      */
103     @Test
104     public void whenSplitStringOnSpecificLength_thenSplit() {
105         String input = "Hello world";
106         List<String> result = Splitter.fixedLength(3).splitToList(input);
107         System.out.println(result);
108     }
109 
110     /**
111      * 限制分割多少字后停止
112      */
113     @Test
114     public void whenLimitSplitting_thenLimited() {
115         String input = "a,b,c,d,e";
116         List<String> result = Splitter.on(",")
117                                       .limit(4)
118                                       .splitToList(input);
119      
120         assertEquals(4, result.size());
121         System.out.println(result);
122     }
123  
124 
125 
126 
127 }

转自http://blog.csdn.net/sunhuwh/article/details/41291515

posted @ 2015-12-08 19:01  人生如若初见  阅读(2716)  评论(0编辑  收藏  举报