将 Bash 字符串转换为 Java 字符串

Question

我想将 bash 变量中存在的字符串转换为 Java 支持的字符串样式。

例如： data="{"5": ">10%", "4": "<5%", "3": ">28 months", "2": "20%", "1": 100}"

作为 echo $data

给我这个结果：

    "{\n" + 
    "    \"1\": 21,\n" + 
    "    \"2\": \"40%\",\n" + 
    "    \"3\": \"<24 months\",\n" + 
    "    \"4\": \"<5%\",\n" + 
    "    \"5\": \">10%\"\n" + 
    "}"

但我还需要使用echo "String data = $data;" >> file.txt 将此值传输到一个文件中，其中数据是处理后的值，它会抛出奇怪的结果

String data = "{
" + 
"   \"5\": \">10%\",
" + 
"   \"4\": \"<5%\",
" + 
"   \"3\": \">28 months\",
" + 
"   \"2\": \"20%\",
" + 
"   \"1\": 100
" + 
"}";

但预期是：

String data = "{\n" + 
        "   \"1\": 50,\n" + 
        "   \"2\": \"40%\",\n" + 
        "   \"3\": \">28 months\",\n" + 
        "   \"4\": \"<5%\",\n" + 
        "   \"5\": \">10%\"\n" + 
        "}";

Answer 1

使用极大的adhoc 方法： （调用 perl 两次）

data='{"5": ">10%", "4": "<5%", "3": ">28 months", "2": "20%", "1": 100}'
echo $data |\
perl -pe 's/{/{\n/; s/}/\n}/; s/, /,\n/g; s/^"/   "/gm' |\
perl -0pe 's/"/\\"/g; s/\n/\\n" + \n/g; s/^/"/gm; s/\}\\n.*$/}"/'

结果是：

 "{\n" +
 "   \"5\": \">10%\",\n" +
 "   \"4\": \"<5%\",\n" +
 "   \"3\": \">28 months\",\n" +
 "   \"2\": \"20%\",\n" +
 "   \"1\": 100\n" +
 "}"

进一步测试：

test='{"first" : "1st", "second": "2nd", "third" : "3rd" }'

echo $test |\
 perl -pe 's/{/{\n/; s/}/\n}/; s/, /,\n/g; s/^"/   "/gm' |\
 perl -0pe 's/"/\\"/g; s/\n/\\n" + \n/g; s/^/"/gm; s/\}\\n.*$/}"/'

返回

"{\n" +
"   \"first\" : \"1st\",\n" +
"   \"second\": \"2nd\",\n" +
"   \"third\" : \"3rd\" \n" +
"}" 

至于输出这个新字符串，试试：

data='{"5": ">10%", "4": "<5%", "3": ">28 months", "2": "20%", "1": 100}'
newdata=$(echo $data |\
perl -pe 's/{/{\n/; s/}/\n}/; s/, /,\n/g; s/^"/   "/gm' |\
perl -0pe 's/"/\\"/g; s/\n/\\n" + \n/g; s/^/"/gm; s/\}\\n.*$/}"/')

echo "String data = $newdata" >> /tmp/file.txt

至于更新（*用sh代替bash，得到2个\ts *），试试下面的 （越来越丑了……'）：

data='{"5": ">10%", "4": "<5%", "3": ">28 months", "2": "20%", "1": 100}'
newdata=$(echo $data |\
perl -pe 's/{/{\n/; s/}/\n}/; s/, /,\n/g; ' |\
perl -0pe 's/"/\\"/g; s/\n/\\n" + \n/g; s/^/"/gm; s/^"/\t\t"/gm; s/^\t\t"/"/; s/\}\\n.*$/}"/')

/bin/echo "String data = $newdata" >> /tmp/file.txt

至于在同一行中获取数组，按照@KNDeeraj 的要求，我们可以使用：

data='{"array": ["v1", "v2"], "5": ">10%", "4": "<5%", "3": ">28 months", "2": "20%", "1": 100}'
newdata=$(echo $data |\
perl -pe 's/{/{\n/; s/}/\n}/; s/, (?!.*?\])/,\n/g; s/^"/   "/gm' |\
perl -0pe 's/"/\\"/g; s/\n/\\n" + \n/g; s/^/"/gm; s/\}\\n.*$/}"/')

echo "String data = $newdata" >> /tmp/file.txt

结果是：

"{\n" +
"   \"array\": [\"v1\", \"v2\"],\n" +
"   \"5\": \">10%\",\n" +
"   \"4\": \"<5%\",\n" +
"   \"3\": \">28 months\",\n" +
"   \"2\": \"20%\",\n" +
"   \"1\": 100\n" +
"}"