outputstream

How to save the file from HTTPS url in JAVA?

由 ﹥＞﹥吖頭↗ 提交于 2019-12-03 00:52:13
I am trying to save a file from URL using outputstream. The URL is secure by https. So I got some error when I try to get the file as the following javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target at sun.security.ssl.Alerts.getSSLException(Unknown Source) at sun.security.ssl.SSLSocketImpl.fatal(Unknown Source) at sun.security.ssl.Handshaker.fatalSE(Unknown Source) at sun.security.ssl.Handshaker.fatalSE(Unknown Source)

Java BufferedOutputStream vs OutputStream [duplicate]

由 北城以北 提交于 2019-12-02 11:02:59
问题 This question already has an answer here : Sockets: BufferedOutputStream or just OutputStream? (1 answer) Closed 4 years ago . What are the differences between BufferedOutputStream and OutputStream. What i've read is that bos is faster and better for large file than os but i don't really understand why. Hope to get some clarification and insight on these 2 topics. 回答1: AS IO operations are costlier, BufferedOutputStream first writes them in buffer and write the chunk on underlying

Given InputStream replace character and produce OutputStream

由 Deadly 提交于 2019-12-02 01:40:58
问题 I have a lot of massive files I need convert to CSV by replacing certain characters. I am looking for reliable approach given InputStream return OutputStream and replace all characters c1 to c2 . Trick here is to read and write in parallel, I can't fit whole file in memory. Do I need to run it in separate thread if I want read and write at the same time? Thanks a lot for your advices. 回答1: To copy data from an input stream to an output stream you write data while you're reading it either a

FileOutputStream opens a new file and deletes the contents whenever it is created

由 a 夏天 提交于 2019-12-01 22:57:45
问题 I'm dealing with serialization and deserialization in files. Moreover, i'm stack about using FileOutputStream with ObjectOutputStream . The issue is i have server/client chat application and whenever a client is connected, server must check that if connected client has registered before. So, when a client is connected to server, server creates an output stream like FileOutputStream fos = new FileOutputStream("src\\example\\mainList.txt"); to get a linkedlist to check whether this list

How can I return a Zip file from my Java server-side using JAX-RS?

由 有些话、适合烂在心里 提交于 2019-12-01 21:14:03
问题 I want to return a zipped file from my server-side java using JAX-RS to the client. I tried the following code, @GET public Response get() throws Exception { final String filePath = "C:/MyFolder/My_File.zip"; final File file = new File(filePath); final ZipOutputStream zop = new ZipOutputStream(new FileOutputStream(file); ResponseBuilder response = Response.ok(zop); response.header("Content-Type", "application/zip"); response.header("Content-Disposition", "inline; filename=" + file.getName());

Java: How to make this Serializable?

由 耗尽温柔 提交于 2019-12-01 20:33:44
问题 I need the following class to be Serializable. package helpers; public class XY implements Comparable<XY> { public int x; public int y; public XY (int x, int y) { this.x = x; this.y = y; } public int compareTo( XY other ) { String compare1 = this.x + "-" + this.y; String compare2 = other.x + "-" + other.y; return compare1.compareTo( compare2 ); } public String toString() { return this.x + "-" + this.y; } } As of now, I can't send it as an object with outputstream..I´ve tried to implement

How can I return a Zip file from my Java server-side using JAX-RS?

由 一曲冷凌霜 提交于 2019-12-01 19:29:28
I want to return a zipped file from my server-side java using JAX-RS to the client. I tried the following code, @GET public Response get() throws Exception { final String filePath = "C:/MyFolder/My_File.zip"; final File file = new File(filePath); final ZipOutputStream zop = new ZipOutputStream(new FileOutputStream(file); ResponseBuilder response = Response.ok(zop); response.header("Content-Type", "application/zip"); response.header("Content-Disposition", "inline; filename=" + file.getName()); return response.build(); } But i'm getting exception as below, SEVERE: A message body writer for Java

Testing what's written to a Java OutputStream

由 狂风中的少年 提交于 2019-12-01 13:46:16
问题 I am about to write junit tests for a XML parsing Java class that outputs directly to an OutputStream. For example xmlWriter.writeString("foo"); would produce something like <aTag>foo</aTag> to be written to the outputstream held inside the XmlWriter instance. The question is how to test this behaviour. One solution would of course be to let the OutputStream be a FileOutputStream and then read the results by opening the written file, but it isn't very elegant. 回答1: Use a ByteArrayOutputStream

Is it ok to be calling reset() on an ObjectOutputStream very frequently?

由 十年热恋 提交于 2019-12-01 08:14:37
I read somewhere which has left me unsure and looking for an alternative way. Does calling reset() too frequently cause strain on the network, or unnecessary for this? I'm sending an object using TCP over an ObjectOutputStream. The objects values get changed before it is written again. Now the same Object but containing different values, without the reset() it resends a reference of the cached object sent before it, which is read to have no changes. I'm not sure if using reset() is a good idea due to such strain. Should I be looking for another way? Example code would be like: Socket socket =

Is it ok to be calling reset() on an ObjectOutputStream very frequently?

由 末鹿安然 提交于 2019-12-01 07:10:40
问题 I read somewhere which has left me unsure and looking for an alternative way. Does calling reset() too frequently cause strain on the network, or unnecessary for this? I'm sending an object using TCP over an ObjectOutputStream. The objects values get changed before it is written again. Now the same Object but containing different values, without the reset() it resends a reference of the cached object sent before it, which is read to have no changes. I'm not sure if using reset() is a good
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